Bennett, R. J., & Estall, R. C. (1991). Global change and challenge: Geography for the 1990s. Routledge.
芝加哥风格引文Bennett, R. J., 与 Robert C. Estall. Global Change and Challenge: Geography for the 1990s. London: Routledge, 1991.
MLA引文Bennett, R. J., 与 Robert C. Estall. Global Change and Challenge: Geography for the 1990s. Routledge, 1991.
警告：这些引文格式不一定是100％准确.