APA

Wingard G. L., . (1993). A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States: an example of the nature of extinction at the boundary. Washington: U.S. G.P.O.

Chicago

Wingard G Lynn, . 1993. A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States: an example of the nature of extinction at the boundary. Washington: U.S. G.P.O.

Harvard

Wingard G. L., . (1993). A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States: an example of the nature of extinction at the boundary. Washington: U.S. G.P.O.

MLA

Wingard G Lynn, . A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States: an example of the nature of extinction at the boundary. Washington: U.S. G.P.O. 1993.