Credits

Steve Mac: Arranger, Producer
Brian Rawling: Producer
Paul Meehan: Producer
Serban Ghenea: Mixing
RedOne: Producer
John Hanes: Mixing
Manny Marroquin: Mixing
Richard Stannard: Producer
Tom Coyne: Mastering
Ash Howes: Mixing, Producer
Steve Robson: Producer
Orlando Calzada: Mixing
Rami Yacoub: Producer
Matt Squire: Producer
Shep Solomon: Producer
Savan Kotecha: Producer
Chris Galland: Assistant
Jimmy Joker: Producer
Tom Meredith: Producer
Phil Seaford: Assistant
Matt Furmidge: Mixing
Carl Falk: Producer
Beatgeek: Producer
Chris Gray [Illustrations]: Illustrations
Niall Horan: Vocals
Eric Madrid: Assistant
Zayn Malik: Vocals
Liam Payne: Vocals
Harry Styles: Vocals
Lou Teasdale: Hair Stylist, Make-Up
Louis Tomlinson: Vocals
John Urbano: Photography
Caroline Watson: Stylist