APA

Bergstrom S. M., Sweet W., . (1966). Conodonts from the Lexington Limestone (Middle Ordovician) of Kentucky, and its lateral equivalents in Ohio and Indiana. New York: Paleontological Research Institution.

Chicago

Bergstrom Stig M, Sweet Walter, . 1966. Conodonts from the Lexington Limestone (Middle Ordovician) of Kentucky, and its lateral equivalents in Ohio and Indiana. New York: Paleontological Research Institution.

Harvard

Bergstrom S. M., Sweet W., . (1966). Conodonts from the Lexington Limestone (Middle Ordovician) of Kentucky, and its lateral equivalents in Ohio and Indiana. New York: Paleontological Research Institution.

MLA

Bergstrom Stig M, Sweet Walter, . Conodonts from the Lexington Limestone (Middle Ordovician) of Kentucky, and its lateral equivalents in Ohio and Indiana. New York: Paleontological Research Institution. 1966.