Stahl, B. J. (1973). Vertebrate history: Problems in evolution. McGraw-Hill.
Cita Chicago (17th ed.)Stahl, Barbara J. Vertebrate History: Problems in Evolution. New York: McGraw-Hill, 1973.
Cita MLA (9th ed.)Stahl, Barbara J. Vertebrate History: Problems in Evolution. McGraw-Hill, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.