ebrary, Inc, Bennett, R. J., & Estall, R. C. (1991). Global change and challenge: Geography for the 1990s. Routledge.
Čikaški stil citiranja (17. izdanje)ebrary, Inc, R. J. Bennett, i Robert C. Estall. Global Change and Challenge: Geography for the 1990s. London ; New York: Routledge, 1991.
MLA način citiranja (9. izdanje)ebrary, Inc, et al. Global Change and Challenge: Geography for the 1990s. Routledge, 1991.
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