APA

Stewart A., . (1915). Further observations on the origin of the Galapagos Islands. : .

Chicago

Stewart Alban, . 1915. Further observations on the origin of the Galapagos Islands. : .

Harvard

Stewart A., . (1915). Further observations on the origin of the Galapagos Islands. : .

MLA

Stewart Alban, . Further observations on the origin of the Galapagos Islands. : . 1915.