APA (7 वां संस्करण) प्रशस्ति पत्र

Não informado. (1893). Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Não informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. Philadelphia, Pa: University of Pennsylvania, Zoological Laboratory, 1893.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Não informado. Contributions from the Zoological Laboratory of the University of Pennsylvania. University of Pennsylvania, Zoological Laboratory, 1893.

चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.