Olson, E. C. (1962). Late Permian terrestrial vertebrates, U.S.A. and U.S.S.R. American Philosophical Society.
芝加哥风格引文Olson, Everett Claire. Late Permian Terrestrial Vertebrates, U.S.A. and U.S.S.R. Philadelphia: American Philosophical Society, 1962.
MLA引文Olson, Everett Claire. Late Permian Terrestrial Vertebrates, U.S.A. and U.S.S.R. American Philosophical Society, 1962.
警告：这些引文格式不一定是100％准确.