Berrill, N. J. (1955). The origin of vertebrates. Clarendon Press.
Cita Chicago (17th ed.)Berrill, N. J. The Origin of Vertebrates. Oxford: Clarendon Press, 1955.
Cita MLA (8th ed.)Berrill, N. J. The Origin of Vertebrates. Clarendon Press, 1955.
Atenció: Aquestes cites poden no estar 100% correctes.