Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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