APA

Ridgway R., . (1895). Preliminary description of some new birds from the Galápagos Islands. : .

Chicago

Ridgway R, . 1895. Preliminary description of some new birds from the Galápagos Islands. : .

Harvard

Ridgway R., . (1895). Preliminary description of some new birds from the Galápagos Islands. : .

MLA

Ridgway R, . Preliminary description of some new birds from the Galápagos Islands. : . 1895.