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Kupfer EM. Studies on Urnula and Geopyxis. „Bulletin of the Torrey Botanical Club”. 29. 3, s. 137–144, 1902. DOI: 10.2307/2478861. JSTOR: 2478861.
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Pfister DH, Slater C, Hansen K. Chorioactidaceae: a new family in the Pezizales (Ascomycota) with four genera. „Mycological research”. Pt 5 (112), s. 513–527, maj 2008. DOI: 10.1016/j.mycres.2007.11.016. PMID: 18406592.