APA

Dawson E. Y., . (1965). An undescribed Melocactus? in the Galapagos Islands. : .

Chicago

Dawson E Y, . 1965. An undescribed Melocactus? in the Galapagos Islands. : .

Harvard

Dawson E. Y., . (1965). An undescribed Melocactus? in the Galapagos Islands. : .

MLA

Dawson E Y, . An undescribed Melocactus? in the Galapagos Islands. : . 1965.