Bass, Drums, Guitar – Shellback Engineer [For Mix, Assistant] – Tim RobertsEngineer [For Mix] – John HanesKeyboards – Max MartinMixed By – Serban GheneaProducer – Max Martin, Shellback Recorded By – Max Martin, Michael Ilbert, Shellback Written-By – Max Martin, Savan Kotecha, Shellback , Tiffany Amber

Backing Vocals [Additional] – Heather BrightCoordinator [Production Coordination] – Donnie Meadows, Tanisha BroadwaterEngineer [Additional] – Mike Daley*Engineer [For Mix, Assistant] – Tim RobertsEngineer [For Mix] – John HanesGuitar – Johannes "Josh" Joergensen*Mixed By – Serban GheneaProducer – Uncle Josh*, Oak Producer [Additional] – Sterling SimmsProducer [Vocals] – Heather Bright, Warren "Oak" Felder*Recorded By – Ralph Cacurri*Written-By – Gary Glitter, Heather Bright, Johannes Joergensen*, Mike Leander, Sterling Simms, Warren "Oak" Felder*

Bass, Drums, Guitar – Shellback Engineer [For Mix, Assistant] – Tim RobertsEngineer [For Mix] – John HanesKeyboards – Max MartinMixed By – Serban GheneaProducer, Recorded By – Max Martin, Shellback Written-By – Max Martin, Savan Kotecha, Shellback

Arranged By [Backing Vocals] – Deborah LurieBacking Vocals – Michaela MorrisBass – Paul BushnellDrums – Dean ButterworthEdited By [Digital] – Paul DeCarliEngineer [Additional] – Hatsukazu Inagaki, Jeremy Underwood Engineer [Mix, Additional] – Andrew Schubert, Brad TownsendEngineer [Mix, Assistant] – Keith Armstrong, Nik KarpenGuitar – Phil Xenidis*Keyboards [Additional] – Kim BullardKeyboards, Programmed By – Howard BensonMixed By – Chris Lord-AlgeProducer – Howard BensonRecorded By – Mike PlotnikoffTechnician [Assistance] – Chris Concepcion*Technician [Drum] – Jon Nicholson Technician [Guitar] – Marc VangoolWritten-By – Michael Dennis Smith*, Miriam Nervo, Olivia Nervo, Stefanie Ridel

Bass, Guitar – Toby GadCello – Victor LawrenceDrums [Bridge - End] – Robin DiazDrums [Verse 2 - Bridge] – Jens GadMixed By, Producer, Recorded By – Toby GadViolin [1st] – Jim Sitterly*Violin [2nd] – Larry GreenfieldWritten-By – Elyssa James, Toby Gad

Backing Vocals [Additional], Keyboards – Leah HaywoodBass – Sean HurleyDrums, Guitar – Daniel JamesEngineer [For Mix, Assistant] – Tim RobertsEngineer [For Mix] – John HanesEngineer [Vocals] – Steve KovacsMixed By – Serban GheneaProducer – DreamlabRecorded By – Daniel JamesWritten-By – Daniel James, Leah Haywood, Shelly Pieken*

Backing Vocals [Additional] – Ravaughn BrownEngineer [Assistant] – Larry Luther, Mike Rienhart, Tyler WellsEngineer [For Mix, Assistant] – Tim RobertsEngineer [For Mix] – John HanesGuitar – Michael BiancanielloKeyboards, Programmed By – Louis BiancanielloMixed By – Serban GheneaProducer – Louis Biancaniello, Sam WattersWritten-By – Louis Biancaniello, Michael Biancaniello, Sam Watters

Bass, Guitar, Programmed By – Dave BassettDrums – Dorian CrozierEngineer [Mix, Additional] – Andrew Schubert, Brad TownsendEngineer [Mix, Assistant] – Keith Armstrong, Nik KarpenMixed By – Chris Lord-AlgeProducer, Recorded By – Dave BassettWritten-By – Dave Bassett, Dilana Trudy Smith*

Backing Vocals – Sharlotte GibsonBass – Paul BushnellDrums – Dean ButterworthEdited By [Digital] – Paul DeCarliEngineer [Additional] – Hatsukazu Inagaki, Jeremy Underwood Engineer [Mix, Additional] – Andrew Schubert, Brad TownsendEngineer [Mix, Assistant] – Keith Armstrong, Nik KarpenGuitar – Phil Xenidis*Keyboards [Additional] – Kim BullardKeyboards, Programmed By – Howard BensonMixed By – Chris Lord-AlgeProducer – Howard BensonRecorded By – Mike PlotnikoffTechnician [Assistance] – Chris Concepcion*Technician [Drum] – Jon Nicholson Technician [Guitar] – Marc VangoolWritten-By – Chioma Eze, Tommy Henriksen

Bass, Guitar, Piano, Programmed By, Synth – Ron AnielloDrums – Josh FreeseEngineer [Mix, Additional] – Andrew Schubert, Brad TownsendEngineer [Mix, Assistant] – Keith Armstrong, Nik KarpenGuitar – Matt BairMixed By – Chris Lord-AlgeProducer – Ron AnielloRecorded By – Clif Norrell, Eddie Jackson , Ron AnielloWritten-By – Aimee Proal*, Ron Aniello, Shelly Pieken*

Bass, Drums, Guitar, Piano – Greg WellsMixed By, Producer – Greg WellsRecorded By – Drew Pearson, Luke TozourWritten-By – Alecia Moore, Greg Wells, Kara DioGuardi

Edited By [Digital] – Ron TaylorEngineer [For Mix, Assistant] – Tim RobertsEngineer [For Mix] – John HanesInstruments [All], Producer – Kevin RudolfMixed By – Serban GheneaWritten-By – Jacob Kasher, Kevin Rudolf

Bass, Guitar – Mitch AllanDrums – Dorian CrozierEdited By [Digital] – Stephen McMorran*Guitar, Keyboards – David HodgesMixed By – Jeff JulianoProducer, Recorded By – David Hodges, Mitch AllanWritten-By – Allison Iraheta, David Bassett*, David Hodges, Mitch Allan