Lyell, C., & Secord, J. A. (1997). Principles of geology. Penguin Books.
Chicago Edition CitationLyell, Charles, and James A. Secord. Principles of Geology. London ; New York: Penguin Books, 1997.
MLA引文Lyell, Charles, and James A. Secord. Principles of Geology. Penguin Books, 1997.
警告:這些引文格式不一定是100%准確.