Bartsch, P. (1918). Classification of the Philippine operculate land shells of the family Helicinidae, with a synopsis of the species and subspecies of the genus Geophorus. Journal of the Washington Academy of Sciences. 8 (20): 643-657 [4 December].
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Bartsch, P.
1918
Classification of the Philippine operculate land shells of the family Helicinidae, with a synopsis of the species and subspecies of the genus <i>Geophorus</i>