Cita APA (7a ed.)

Atkinson, W. C. (1961). A history of Spain and Portugal. Penguin Books.

Cita Chicago Style (17a ed.)

Atkinson, William C. A History of Spain and Portugal. Harmonsworth (Inglaterra): Penguin Books, 1961.

Cita MLA (8a ed.)

Atkinson, William C. A History of Spain and Portugal. Penguin Books, 1961.