Hallowell, E. (1852). On a new genus and two new species of African serpents. Zenodo.
Citazione stile Chigago Style (17a edizione)Hallowell, Edward. On a New Genus and Two New Species of African Serpents. Zenodo, 1852.
Citatione MLA (9a ed.)Hallowell, Edward. On a New Genus and Two New Species of African Serpents. Zenodo, 1852.
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