Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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