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Teichert & Glenister |
1952 |
Lower Permian ammonoids from the Irwin Basin, Western Australia.
Journal of Paleontology., 26 (1): 12-23, fig.1-4, tab.1-6, pl.3-4; Tulsa,Oklahoma.
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Tharalson |
1984 |
Revision of the Early Permian ammonoid family Perrinitidae.
Journal of Paleontology, 58 (3): 804-833, fig.1-24, 1tab.; Lawrence, Kansas.
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