APA (7th ed.) Citation

Llanas, A., Williams, L., & Ospina, L. J. (1999). Freestyle 1: Student's book. MacMillan.

Chicago Style (17th ed.) Citation

Llanas, Angela, Libby Williams, and Luz Janeth Ospina. Freestyle 1: Student's Book. Oxford: MacMillan, 1999.

MLA (9th ed.) Citation

Llanas, Angela, et al. Freestyle 1: Student's Book. MacMillan, 1999.