APA

Pritchard P. C. H., . (1971). A further report on Galapagos tortoises. : .

Chicago

Pritchard Peter C H, . 1971. A further report on Galapagos tortoises. : .

Harvard

Pritchard P. C. H., . (1971). A further report on Galapagos tortoises. : .

MLA

Pritchard Peter C H, . A further report on Galapagos tortoises. : . 1971.