Cita APA (7th ed.)

Carroll, J., & Johnston, T. (1988). Insight guides: Northern California. APA Pub.

Cita Chicago (17th ed.)

Carroll, Jon, i Tracy Johnston. Insight Guides: Northern California. Singapore: APA Pub, 1988.

Cita MLA (9th ed.)

Carroll, Jon, i Tracy Johnston. Insight Guides: Northern California. APA Pub, 1988.