APA

Dawson E. Y., . (1962). Cacti of the Galápagos Islands and of coastal Ecuador. : .

Chicago

Dawson E Yale, . 1962. Cacti of the Galápagos Islands and of coastal Ecuador. : .

Harvard

Dawson E. Y., . (1962). Cacti of the Galápagos Islands and of coastal Ecuador. : .

MLA

Dawson E Yale, . Cacti of the Galápagos Islands and of coastal Ecuador. : . 1962.