Note—An Early Classic Misplaced: Ford W. Harris's Economic Order Quantity Model of 1915
指出哈里斯1915年提出的经济订货批量平方根公式原始论文长期被错误引用，实际无法找到，并强调该论文在管理科学概念呈现上的示范价值，值得今日研究者学习其建模清晰度和动机有效性。
The familiar square-root formula for the optimal economic order quantity was derived originally by Harris in 1915 (Harris, F. W. 1915. What quantity to make at once. The Library of Factory Management, Vol. V. Operation and Costs. A. W. Shaw Company, Chicago, 47–52.). Since all citations found to Harris's paper over the past 35 years are incorrect, it seems that no one has been able to locate the paper during this period. The paper's apparent misplacement probably stems from an inaccurate citation given by Raymond in 1931 (Raymond, F. E. 1931. Quantity and Economy in Manufacture. McGraw-Hill, New York.). Harris's paper exemplifies skillful presentation of the concepts of management science, and still merits reading. Today's researcher can learn much from Harris's modeling approach, and would do well to emulate his expositional clarity and motivational effectiveness.