APA (7th ed.) Zitazioa

Denham, C., & Lieberman, A. (1980). Time to learn. U.S. Department of education.

Chicago Style (17th ed.) Zitazioa

Denham, Carolyn, eta Ann Lieberman. Time to Learn. California: U.S. Department of education, 1980.

MLA (9th ed.) Zitazioa

Denham, Carolyn, eta Ann Lieberman. Time to Learn. U.S. Department of education, 1980.