APA (7e ed.) Bronvermelding

Walker, M. Addison-Wesley ESL: Student Book B (1a. ed.). Addison-Wesley.

Chicago (17e ed.) Bronvermelding

Walker, Michael. Addison-Wesley ESL: Student Book B. 1a. ed. New York: Addison-Wesley.

MLA (9e ed.) Bronvermelding

Walker, Michael. Addison-Wesley ESL: Student Book B. 1a. ed. Addison-Wesley.