Não informado. (1927). Journal of Paleontology. Society of Economic Paleontologists and Mineralogists.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of Paleontology. Tulsa, Okla: Society of Economic Paleontologists and Mineralogists, 1927.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of Paleontology. Society of Economic Paleontologists and Mineralogists, 1927.
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