Cita APA (7a ed.)

Bourne, M. R. Let's speak english. Second year High School. Bruño.

Cita Chicago Style (17a ed.)

Bourne, Michael R. Let's Speak English. Second Year High School. Lima: Bruño.

Cita MLA (9a ed.)

Bourne, Michael R. Let's Speak English. Second Year High School. Bruño.