Morris, P. A. (1980). The bryozoan family Hippothoidae (Cheilostomata-Ascophora), with emphasis on the genus Hippothoa. University of Southern California. Allan Hancock Foundation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMorris, Penny A. The Bryozoan Family Hippothoidae (Cheilostomata-Ascophora), with Emphasis on the Genus Hippothoa. Los Angeles, Calif: University of Southern California. Allan Hancock Foundation, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMorris, Penny A. The Bryozoan Family Hippothoidae (Cheilostomata-Ascophora), with Emphasis on the Genus Hippothoa. University of Southern California. Allan Hancock Foundation, 1980.
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