Não informado. (1893). Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. Philadelphia, Pa: University of Pennsylvania, Zoological Laboratory, 1893.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory, 1893.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.