Cita APA (7a ed.)

Warn, S., Naish, M., & Sleep, S. (2001). Changing environments: AS level geography for Edexcel B (1. publ., 5. impression.). Longman.

Cita Chicago Style (17a ed.)

Warn, Sue, Michael Naish, y Sue Sleep. Changing Environments: AS Level Geography for Edexcel B. 1. publ., 5. impression. Harlow: Longman, 2001.

Cita MLA (9a ed.)

Warn, Sue, et al. Changing Environments: AS Level Geography for Edexcel B. 1. publ., 5. impression. Longman, 2001.