Gregory, K. J., & Walling, D. E. (1981). Man and environmental processes: A physical geography perspective. Butterworths.
芝加哥风格引文Gregory, K. J., 与 D. E. Walling. Man and Environmental Processes: A Physical Geography Perspective. London: Butterworths, 1981.
MLA引文Gregory, K. J., 与 D. E. Walling. Man and Environmental Processes: A Physical Geography Perspective. Butterworths, 1981.
警告：这些引文格式不一定是100％准确.