Cita APA (7th ed.)

Walker, M. (1980). Yes! English for Children (2a. ed.). Addison Wesley Publishing Company.

Cita Chicago (17th ed.)

Walker, Michael. Yes! English for Children. 2a. ed. EEUU: Addison Wesley Publishing Company, 1980.

Cita MLA (9th ed.)

Walker, Michael. Yes! English for Children. 2a. ed. Addison Wesley Publishing Company, 1980.