APA (7e ed.) Bronvermelding

Langan, J. (1981). English Skills (2nd ed.). McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Langan, John. English Skills. 2nd ed. New York: McGraw-Hill, 1981.

MLA (9e ed.) Bronvermelding

Langan, John. English Skills. 2nd ed. McGraw-Hill, 1981.