Cita APA (7a ed.)

Downie, M. (1995). Freeform: Student's book 1. Santillana.

Cita Chicago Style (17a ed.)

Downie, Michael. Freeform: Student's Book 1. Buenos Aires: Santillana, 1995.

Cita MLA (9a ed.)

Downie, Michael. Freeform: Student's Book 1. Santillana, 1995.