Cita APA (7th ed.)

Campbell, L. (1989). Insight guides: New York. APA Pub.

Cita Chicago (17th ed.)

Campbell, Louisa. Insight Guides: New York. Singapore: APA Pub, 1989.

Cita MLA (9th ed.)

Campbell, Louisa. Insight Guides: New York. APA Pub, 1989.

Atenció: Aquestes cites poden no estar 100% correctes.