Cita APA (7th ed.)

ebrary, Inc, Bennett, R. J., & Estall, R. C. (1991). Global change and challenge: Geography for the 1990s. Routledge.

Cita Chicago (17th ed.)

ebrary, Inc, R. J. Bennett, i Robert C. Estall. Global Change and Challenge: Geography for the 1990s. London ; New York: Routledge, 1991.

Cita MLA (9th ed.)

ebrary, Inc, et al. Global Change and Challenge: Geography for the 1990s. Routledge, 1991.