APA

Snow D. W. S. B. K., . (1967). The breeding cycle of the swallow-tailed gull Creagrus furcatus. : .

Chicago

Snow D W Snow B K, . 1967. The breeding cycle of the swallow-tailed gull Creagrus furcatus. : .

Harvard

Snow D. W. S. B. K., . (1967). The breeding cycle of the swallow-tailed gull Creagrus furcatus. : .

MLA

Snow D W Snow B K, . The breeding cycle of the swallow-tailed gull Creagrus furcatus. : . 1967.