Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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