Clifford, N., French, S., & Valentine, G. (2010). Key methods in Geography (2a. ed.). Sage.
芝加哥风格引文Clifford, Nicholas, Shaun French, 与 Gill Valentine. Key Methods in Geography. 2a. ed. Los Angeles: Sage, 2010.
MLA引文Clifford, Nicholas, et al. Key Methods in Geography. 2a. ed. Sage, 2010.
警告：这些引文格式不一定是100％准确.