Não informado. (1893). Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory.
Chicago (17e ed.) BronvermeldingNão informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. Philadelphia, Pa: University of Pennsylvania, Zoological Laboratory, 1893.
MLA (8e ed.) BronvermeldingNão informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory, 1893.
Let op: Deze citaties zijn niet altijd 100% accuraat.