Keir, P. M. (1984). Echinoids from the Triassic (St. Cassian) of Italy, their lantern supports, and a revised phylogeny of Triassic ecchinoids. Washington, D. C.: Smithsonian Institution Press.
Chicago Style CitationKeir, Porter M.. Echinoids From the Triassic (St. Cassian) of Italy, Their Lantern Supports, and a Revised Phylogeny of Triassic Ecchinoids. Washington, D. C.: Smithsonian Institution Press, 1984.
MLA CitationKeir, Porter M.. Echinoids From the Triassic (St. Cassian) of Italy, Their Lantern Supports, and a Revised Phylogeny of Triassic Ecchinoids. Washington, D. C.: Smithsonian Institution Press, 1984.
Warning: These citations may not always be 100% accurate.