APA (7 वां संस्करण) प्रशस्ति पत्र

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

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

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

एमएलए (9वां संस्करण) प्रशस्ति पत्र

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