Kier, P. M. (1972). Upper Miocene echinoids from the Yorktown Formation of Virginia and their environmental significance. City of Washington: Smithsonian Institution Press.
Styl ChicagoKier, Porter M. Upper Miocene Echinoids From the Yorktown Formation of Virginia and Their Environmental Significance. City of Washington: Smithsonian Institution Press, 1972.
Citace podle MLAKier, Porter M. Upper Miocene Echinoids From the Yorktown Formation of Virginia and Their Environmental Significance. City of Washington: Smithsonian Institution Press, 1972.
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