APA استشهاد

Atkins, W. C. (1960). History of spain and portugal. Penguin books.

استشهاد بنمط شيكاغو

Atkins, William C. History of Spain and Portugal. Harmondsworth: Penguin books, 1960.

MLA استشهاد

Atkins, William C. History of Spain and Portugal. Penguin books, 1960.