GREENWOOD, N., & EDWARDS, J. (1979). Human environments and natural systems. -- 2nd ed. Duxbury Press.
芝加哥风格引文GREENWOOD, N.H, 与 J.M.B EDWARDS. Human Environments and Natural Systems. -- 2nd Ed. North Scituate: Duxbury Press, 1979.
MLA引文GREENWOOD, N.H, 与 J.M.B EDWARDS. Human Environments and Natural Systems. -- 2nd Ed. Duxbury Press, 1979.
警告：这些引文格式不一定是100％准确.