Cita APA (7a ed.)

Zanatta, T., Leary, J., Czajka, P., & Giorgi, P. (2006). Howdy level 1: Course book. Santillana.

Cita Chicago Style (17a ed.)

Zanatta, Theresa, Judith Leary, Paula Czajka, y Paula Giorgi. Howdy Level 1: Course Book. Buenos Aires: Santillana, 2006.

Cita MLA (9a ed.)

Zanatta, Theresa, et al. Howdy Level 1: Course Book. Santillana, 2006.