APA

Rossman D. A., .Morphological variation in the endemic colombian water snake, Helicops danieli Amaral, 1937 (Serpentes: Xenodontidae). : .

Chicago

Rossman Douglas A, .Morphological variation in the endemic colombian water snake, Helicops danieli Amaral, 1937 (Serpentes: Xenodontidae). : .

Harvard

Rossman D. A., .Morphological variation in the endemic colombian water snake, Helicops danieli Amaral, 1937 (Serpentes: Xenodontidae). : .

MLA

Rossman Douglas A, .: . .