Cita APA

Ernst, C. H., Barbour, R. W. 1., & Lovich, J. E. (1994). Turtles of the United States and Canada. Washington: Smithsonian Institution Press.

Citación estilo Chicago

Ernst, Carl H., Róger W. 1919- Barbour, y Jeffrey E. Lovich. Turtles of the United States and Canada. Washington: Smithsonian Institution Press, 1994.

Cita MLA

Ernst, Carl H., Róger W. 1919- Barbour, y Jeffrey E. Lovich. Turtles of the United States and Canada. Washington: Smithsonian Institution Press, 1994.