Fritz, M. A. (1977). Redescription of type specimens of species of the bryozoan genera Atactoporella, Homotrypa, and Homotrypella, from the Upper Ordovician rocks of the Credit River Valley, Ontario, Canada. Royal Ontario Museum.
Chicago Style (17th ed.) CitationFritz, Madeleine A. Redescription of Type Specimens of Species of the Bryozoan Genera Atactoporella, Homotrypa, and Homotrypella, from the Upper Ordovician Rocks of the Credit River Valley, Ontario, Canada. Toronto: Royal Ontario Museum, 1977.
MLA (8th ed.) CitationFritz, Madeleine A. Redescription of Type Specimens of Species of the Bryozoan Genera Atactoporella, Homotrypa, and Homotrypella, from the Upper Ordovician Rocks of the Credit River Valley, Ontario, Canada. Royal Ontario Museum, 1977.
Warning: These citations may not always be 100% accurate.