Não informado. (1893). Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory.
Chicago Style (17. basım) AtıfNão informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. Philadelphia, Pa: University of Pennsylvania, Zoological Laboratory, 1893.
MLA (8th ed.) AtıfNão informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory, 1893.
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