APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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