APA

Stuart F. S., . (1966). A seal's world. New York, USA: Pyramid Books.

Chicago

Stuart Frank S, . 1966. A seal's world. New York, USA: Pyramid Books.

Harvard

Stuart F. S., . (1966). A seal's world. New York, USA: Pyramid Books.

MLA

Stuart Frank S, . A seal's world. New York, USA: Pyramid Books. 1966.