bass Santi Gonzalez
bongos, cowbell José Mangual Jr.
congas Milton Cardona
coro Justo Betancourt
design Ron Levine
engineer Jon Fausty
lead vocals Hector Lavoe
photography by Lee Marshall
piano José Torres
producer Jerry Masucci
producer, coro, trombone Willie Colón
recorded by [recording director], coro Johnny Pacheco
timbales Louie Romero
trombone Eric Matos
Recorded At Good Vibrations Sound Studios
Phonographic Copyright (p) Fania Records, Inc.
Copyright (c) Fania Records, Inc.
Lacquer Cut At Sterling Sound
Pressed By Sonic Recording Products, Inc.
Pressed By Sonic Recording Products, Inc.
Track B3 is credited as D.R.

Recorded at Good Vibrations Sound Studios, 1440 Broadway, New York City

Mechanical Madness: Steve Higgins
Model for photo: Jose R. Padron
Was
Matrix / Runout: SLP 00444 A MIII K5990 STERLING SON (Side A, etched)
Matrix / Runout: SLP 00444 B MIII K5991 (Side B, etched)
Pressing Plant ID: SON (In runout)