Cita APA (7a ed.)

Sale, C. J., Wilson, G., & Friedman, B. (1988). Understanding our world (1. publ.). Longman Cheshire.

Cita Chicago Style (17a ed.)

Sale, Colin J., Graeme Wilson, y Ben Friedman. Understanding Our World. 1. publ. Melbourne: Longman Cheshire, 1988.

Cita MLA (9a ed.)

Sale, Colin J., et al. Understanding Our World. 1. publ. Longman Cheshire, 1988.