Sagan, C., & Leonard, J. N. 1. j. a. (1972). Planets. Time-Life Books.
芝加哥风格引文Sagan, Carl, 与 Jonathan Norton 1903- joint auth Leonard. Planets. New York: Time-Life Books, 1972.
MLA引文Sagan, Carl, 与 Jonathan Norton 1903- joint auth Leonard. Planets. Time-Life Books, 1972.
警告：这些引文格式不一定是100％准确.