APA

Pritchard P. C. H., . (1986). "The Galapagos tortises" by Samuel Garmen, 1917. : .

Chicago

Pritchard Peter C H, . 1986. "The Galapagos tortises" by Samuel Garmen, 1917. : .

Harvard

Pritchard P. C. H., . (1986). "The Galapagos tortises" by Samuel Garmen, 1917. : .

MLA

Pritchard Peter C H, . "The Galapagos tortises" by Samuel Garmen, 1917. : . 1986.