Heady, E. O., & Srivastava, U. K. (1975). Spatial sector programming models in agriculture. Iowa State university.
芝加哥风格引文Heady, Earl O., 与 Uma K. Srivastava. Spatial Sector Programming Models in Agriculture. Ames: Iowa State university, 1975.
MLA引文Heady, Earl O., 与 Uma K. Srivastava. Spatial Sector Programming Models in Agriculture. Iowa State university, 1975.
警告：这些引文格式不一定是100％准确.