APA

Wellington G. M. d. V. T., . (1976). The South American sea lion, Otaria byronia, in the Galápagos Islands. : .

Chicago

Wellington G M de Vries T, . 1976. The South American sea lion, Otaria byronia, in the Galápagos Islands. : .

Harvard

Wellington G. M. d. V. T., . (1976). The South American sea lion, Otaria byronia, in the Galápagos Islands. : .

MLA

Wellington G M de Vries T, . The South American sea lion, Otaria byronia, in the Galápagos Islands. : . 1976.