Cita APA (7th ed.)

Downie, M. (1999). Your Turn: Student's book 1 (1a. ed.). Richmond Publishing.

Cita Chicago (17th ed.)

Downie, Michael. Your Turn: Student's Book 1. 1a. ed. Buenos Aires: Richmond Publishing, 1999.

Cita MLA (9th ed.)

Downie, Michael. Your Turn: Student's Book 1. 1a. ed. Richmond Publishing, 1999.