APA

Geiman Q. M. W. R., . (1937). Intestinal protozoa from Galapagos tortoises (with description of three new species). : .

Chicago

Geiman Q M Wichterman R, . 1937. Intestinal protozoa from Galapagos tortoises (with description of three new species). : .

Harvard

Geiman Q. M. W. R., . (1937). Intestinal protozoa from Galapagos tortoises (with description of three new species). : .

MLA

Geiman Q M Wichterman R, . Intestinal protozoa from Galapagos tortoises (with description of three new species). : . 1937.