Cita APA (7th ed.)

Ward, P. D. (1992). On Methuselah's trail: Living fossils and the great extinctions. W.H. Freeman.

Cita Chicago (17th ed.)

Ward, Peter Douglas. On Methuselah's Trail: Living Fossils and the Great Extinctions. New York: W.H. Freeman, 1992.

Cita MLA (9th ed.)

Ward, Peter Douglas. On Methuselah's Trail: Living Fossils and the Great Extinctions. W.H. Freeman, 1992.