Numeroff, L. J., & McPhail, D. (2006). When sheep sleep. Abrams Books for Young Readers.
芝加哥风格引文Numeroff, Laura Joffe, 与 David McPhail. When Sheep Sleep. New York: Abrams Books for Young Readers, 2006.
MLA引文Numeroff, Laura Joffe, 与 David McPhail. When Sheep Sleep. Abrams Books for Young Readers, 2006.
警告：这些引文格式不一定是100％准确.