Cita APA (7a ed.)

Hill, A. F. (1991). Insight guides: Portugal. APA Pub.

Cita Chicago Style (17a ed.)

Hill, Alison F. Insight Guides: Portugal. Singapore: APA Pub, 1991.

Cita MLA (9a ed.)

Hill, Alison F. Insight Guides: Portugal. APA Pub, 1991.