Cooper, G. A.; Grant, R. E. (1976). Permian Brachiopods from West Texas, IV. <em>Smithsonian Contributions to Paleobiology.</em> 21: 1923-2607.[details]
Traits (2024). Phrenophoria irregularis Cooper & Grant, 1976 †. Accessed at: https://www.marinespecies.org/traits./aphia.php?p=taxdetails&id=1730961 on 2024-09-21
Marine Species Traits editorial board (2024). Marine Species Traits. Phrenophoria irregularis Cooper & Grant, 1976 †. Accessed at: https://marinespecies.org/traits./aphia.php?p=taxdetails&id=1730961 on 2024-09-21
original descriptionCooper, G. A.; Grant, R. E. (1976). Permian Brachiopods from West Texas, IV. <em>Smithsonian Contributions to Paleobiology.</em> 21: 1923-2607.[details]