Cita APA (7a ed.)

Hofer, H. (1991). Insight guides: Singapore. APA Pub.

Cita Chicago Style (17a ed.)

Hofer, Hans. Insight Guides: Singapore. Singapore: APA Pub, 1991.

Cita MLA (9a ed.)

Hofer, Hans. Insight Guides: Singapore. APA Pub, 1991.