APA (7th ed.) Zitazioa

Willis, H. (1971). Basic usage, vocabulary, and composition. Holt Rinehart and Winston.

Chicago Style (17th ed.) Zitazioa

Willis, Hulon. Basic Usage, Vocabulary, and Composition. New York: Holt Rinehart and Winston, 1971.

MLA (9th ed.) Zitazioa

Willis, Hulon. Basic Usage, Vocabulary, and Composition. Holt Rinehart and Winston, 1971.