Somermeyer, W. H. (1970). Multipolar human-flow models. Econometric Inst., Netherlands School of Economics.
芝加哥风格引文Somermeyer, W. H. Multipolar Human-flow Models. Rotterdam: Econometric Inst., Netherlands School of Economics, 1970.
MLA引文Somermeyer, W. H. Multipolar Human-flow Models. Econometric Inst., Netherlands School of Economics, 1970.
警告：这些引文格式不一定是100％准确.