APA (7 वां संस्करण) प्रशस्ति पत्र

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

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

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

एमएलए (9वां संस्करण) प्रशस्ति पत्र

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