Não informado. (1893). Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory.
Cita Chicago Style (17a ed.)Não informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. Philadelphia, Pa: University of Pennsylvania, Zoological Laboratory, 1893.
Cita MLA (8a ed.)Não informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory, 1893.
Precaución: Estas citas no son 100% exactas.