Denham, C., & Lieberman, A. (1980). Time to learn. U.S. Department of education.
芝加哥风格引文Denham, Carolyn, 与 Ann Lieberman. Time to Learn. California: U.S. Department of education, 1980.
MLA引文Denham, Carolyn, 与 Ann Lieberman. Time to Learn. U.S. Department of education, 1980.
警告：这些引文格式不一定是100％准确.