bass Roberto Villaseñor
congas Marco A. Sanchez
drum programming Maxi Salazar
engineer, mixed by Horacio Zaldivar
engineer, musical assistance Juan Barbosa
keyboards Lauro Lopez
lead guitar, harmony vocals Ignacio Leyva
written-by, arranged by, cymbal, electric guitar, harmony vocals Rigo Tovar
Matrix / Runout: LASI-3012-A 12-III-85 Ulises (Runout Side A)
Matrix / Runout: LASI-3012-B 12-III-85 Ulises (Runout Side B)