APA-referens (7:e uppl.)

Bey, V., Concheff, B. J., & Yates, J. (2017). Spanish verb drills (Fifth edition.). McGraw-Hill Education.

Chicago-referens (17:e uppl.)

Bey, Vivienne, Beatrice Jorgensen Concheff, och Jean Yates. Spanish Verb Drills. Fifth edition. New York: McGraw-Hill Education, 2017.

MLA-referens (9:e uppl.)

Bey, Vivienne, et al. Spanish Verb Drills. Fifth edition. McGraw-Hill Education, 2017.