APA (7th ed.) Citation

Atkinson, W. C. (1960). A history of Spain and Portugal. Penguin Books.

Chicago Style (17th ed.) Citation

Atkinson, William C. A History of Spain and Portugal. Harmondsworth, Middlesex: Penguin Books, 1960.

MLA (9th ed.) Citation

Atkinson, William C. A History of Spain and Portugal. Penguin Books, 1960.