APA (7th ed.) Citation

Willis, H. (1970). Introductory languages study. Schenkman Pub. Co..

Chicago Style (17th ed.) Citation

Willis, Hulon. Introductory Languages Study. Cambridge: Schenkman Pub. Co., 1970.

MLA (9th ed.) Citation

Willis, Hulon. Introductory Languages Study. Schenkman Pub. Co., 1970.

Warning: These citations may not always be 100% accurate.