Citazione Stile APA (7a Edizione)

Walker, M. (1989). ESL: Activity book. Addison-Wesley Publishing Company.

Citazione stile Chigago Style (17a edizione)

Walker, Michael. ESL: Activity Book. New York, EUA: Addison-Wesley Publishing Company, 1989.

Citatione MLA (9a ed.)

Walker, Michael. ESL: Activity Book. Addison-Wesley Publishing Company, 1989.