Backing Vocals – Damon Bunetta, Ian Franzino, Julian Bunetta, Ruth Anne Cunningham*Bass, Guitar, Keyboards, Programmed By, Vocals [Gang Vocals] – Matt Rad*Drums – Stefan LitrownikEngineer – John Ryan , Julian Bunetta, Matt Rad*Engineer [For Mix] – John HanesEngineer [Vocals] – Alex OrietEngineer, Vocals [Gang Vocals] – Petros Anastos-PrastacosInstruments [All Other] – John Ryan , Julian BunettaMixed By – Serban GheneaProducer – John Ryan , Julian Bunetta, Matt Rad*Written-By – Ed Drewett, John Ryan , Julian Bunetta, Wayne Hector

Arranged By [Strings], Strings – Christine WuBacking Vocals – Damon Bunetta, Ian Franzino, Jamie Scott, John Ryan , Julian Bunetta, Peter BunettaEngineer – Alex Oriet, Ben "Bengineer" Chang*, John Ryan , Julian BunettaEngineer [Assistant] – Ian FranzinoEngineer [Mix, Assistant] – Ryan LipmanInstruments [All], Producer [Vocals] – Jamie Scott, John Ryan , Julian BunettaMixed By – Joe ZookProducer – John Ryan , Julian BunettaWritten-By – Harry Styles, Jamie Scott, John Ryan , Julian Bunetta, Liam Payne, Louis Tomlinson, Niall Horan, Zayn Malik*

Backing Vocals – Damon Bunetta, Daniel Weiner, Jamie Scott, John Ryan , Julian BunettaEngineer [Assistant] – Ian FranzinoEngineer [Mix, Assistant] – Ryan LipmanEngineer [Vocals] – Alex Oriet, Ben "Bengineer" Chang*Engineer, Instruments [All], Producer – John Ryan , Julian BunettaMixed By – Joe ZookProducer [Vocals] – Jamie Scott, John Ryan , Julian BunettaWritten-By – Jamie Scott, John Ryan , Julian Bunetta, Liam Payne, Louis Tomlinson

Engineer [Assistant] – Ian FranzinoEngineer [Mix, Assistant] – Ryan LipmanEngineer, Producer – John Ryan , Julian BunettaInstruments [All] – Damon Bunetta, Ian Franzino, Jamie Scott, John Ryan , Julian Bunetta, Peter BunettaMixed By – Joe ZookProducer [Vocals] – Jamie Scott, John Ryan , Julian BunettaWritten-By – Jamie Scott, John Ryan , Julian Bunetta, Liam Payne, Louis Tomlinson

Acoustic Guitar – John Ryan Arranged By [Strings], Strings – Christine WuEngineer [Assistant] – Ian FranzinoEngineer, Instruments [All Other], Producer – John Ryan , Julian BunettaMixed By – Ash HowesWritten-By – Jamie Scott, John Ryan , Julian Bunetta

Mixed By – Ash HowesProducer – Danny Jones , Dougie Poynter, Tom Fletcher Written-By – Danny Jones , Dougie Poynter, Niall Horan, Tom Fletcher

Backing Vocals – Damon Bunetta, Daniel Weiner, John Ryan , Julian BunettaEngineer [Assistant] – Ian FranzinoEngineer, Instruments [All Other], Producer – John Ryan , Julian BunettaGuitar – Jaco CaracoMixed By – Ash HowesWritten-By – Jamie Scott, John Ryan , Julian Bunetta, Louis Tomlinson

Acoustic Guitar, Electric Guitar, Instruments [All Other], Programmed By – Carl Falk Backing Vocals [Additional] – Savan KotechaBanjo, Mandolin – Ilya ToshinskyBass – Chris Patrick Edited By [Vocals], Producer [Vocals] – Kristian LundinEngineer [For Mix] – John HanesEngineer [Vocals] – Alex Oriet, Ben "Bengineer" Chang*Mixed By – Serban GheneaProducer – Carl Falk Recorded By [Vocals] – Kristian Lundin, Savan KotechaWritten-By – Carl Falk , Harry Styles, Savan Kotecha

Acoustic Guitar, Bass, Drum Programming, Drums, Electric Guitar, Instrumentation By [All Additional], Piano – Ryan TedderEngineer – Ryan Tedder, Tim ThomasEngineer [Mix, Assistant] – Ryan LipmanMixed By – Joe ZookProducer [Additional Vocals] – Jake GoslingProducer, Producer [Vocals] – Ryan TedderWritten-By – Harry Styles, Liam Payne, Louis Tomlinson, Ryan Tedder

Backing Vocals, Producer – John Ryan , Julian Bunetta, Teddy GeigerBass – Teddy GeigerDrums – Julian BunettaEngineer [Assistant] – Ian FranzinoEngineer [Mix, Assistant] – Ryan LipmanEngineer, Producer [Vocals] – John Ryan , Julian BunettaGuitar – John Ryan Mixed By – Joe ZookWritten-By – John Ryan , Julian Bunetta, Liam Payne, Louis Tomlinson, John Theodore Geiger*

Backing Vocals – Jamie ScottEngineer – Alex Oriet, Ben "Bengineer" Chang*, Sam Miller, Tom FullerEngineer [Mix, Assistant] – Ryan LipmanInstruments [All] – Jamie Scott, John Ryan , Toby SmithMixed By – Joe ZookProducer – Jamie Scott, Toby SmithProducer [Additional] – John Ryan Written-By – Jamie Scott, Liam Payne, Louis Tomlinson, Toby Smith

Bass, Drums, Guitar, Keyboards, Percussion – Jacknife LeeEngineer – Jacknife Lee, Matt Bishop Engineer [Vocal Recording] – Alex OrietMixed By – Mark "Spike" Stent*Mixed By [Assistant] – Geoff SwanPiano – Chris ThornberryProducer – Jacknife LeeStrings – Davide RossiWritten-By – Gary Lightbody, Harry Styles, Jacknife Lee

Backing Vocals – Damon Bunetta, Daniel Weiner, John Ryan , Julian BunettaEngineer [Assistant] – Ian FranzinoEngineer [Mix, Assistant] – Ryan LipmanEngineer, Producer – John Ryan , Julian BunettaInstruments [All] – Julian BunettaMixed By – Joe ZookWritten-By – Ed Drewett, John Ryan , Julian Bunetta, Liam Payne, Louis Tomlinson, Wayne Hector

Backing Vocals – John Ryan Engineer [Assistant] – Ian FranzinoEngineer, Instruments [All], Producer, Producer [Vocals] – John Ryan , Julian BunettaMixed By – Ash HowesRecorded By [Vocals] – Alex Oriet, Ben "Bengineer" Chang*Written-By – John Ryan , Julian Bunetta, Liam Payne, Louis Tomlinson

Bass, Keyboards – Steve RobsonDrums – Eddie Thrower*Engineer – Sam MillerGuitar – Luke Potashnick, Steve RobsonMixed By, Producer – Steve RobsonWritten-By – Claude Kelly, Louis Tomlinson, Steve Robson, Wayne Hector

Backing Vocals – Damon Bunetta, Ian Franzino, Jamie Scott, John Ryan , Julian Bunetta, Peter BunettaEngineer [Assistant] – Ian FranzinoEngineer, Instruments [All], Producer – John Ryan , Julian BunettaMixed By – Ash HowesProducer [Vocals] – Jamie Scott, John Ryan , Julian BunettaRecorded By [Vocals] – Alex OrietWritten-By – Jamie Scott, John Ryan , Julian Bunetta, Liam Payne, Louis Tomlinson

Backing Vocals, Instruments [All], Producer – John Ryan , Julian Bunetta, Matt Rad*Engineer – John Ryan , Julian Bunetta, Matt Rad*Engineer [Assistant] – Ian FranzinoProducer [Vocals] – John Ryan , Julian BunettaWritten-By – Jamie Scott, John Ryan , Julian Bunetta, Louis Tomlinson

Arranged By [Strings] – Pete WhitfieldBass, Keyboards – Steve RobsonCello – Dale Culliford, Nick Trygstad, Simon Turner Drums – Karl BrazilEngineer – Sam MillerEngineer [For Mix] – John HanesGuitar – Chris LeonardMixed By – Serban GheneaProducer – Steve RobsonViolin – Alex Stemp, Paulette Bayley, Pete Whitfield, Sarah Brandwood-SpencerWritten-By – Ed Drewett, Lindy Robbins, Steve Robson