APA

Barlow G. W., . (1972). A paternal role for bulls of the Galapagos Islands sea-lion. : .

Chicago

Barlow G W, . 1972. A paternal role for bulls of the Galapagos Islands sea-lion. : .

Harvard

Barlow G. W., . (1972). A paternal role for bulls of the Galapagos Islands sea-lion. : .

MLA

Barlow G W, . A paternal role for bulls of the Galapagos Islands sea-lion. : . 1972.