APA (7e ed.) Bronvermelding

Willis, H. (1979). Basic usage vocabulary, and composition (3rd ed.). Holt, Rinehart & Winston.

Chicago (17e ed.) Bronvermelding

Willis, Hulon. Basic Usage Vocabulary, and Composition. 3rd ed. N. Y: Holt, Rinehart & Winston, 1979.

MLA (9e ed.) Bronvermelding

Willis, Hulon. Basic Usage Vocabulary, and Composition. 3rd ed. Holt, Rinehart & Winston, 1979.