Association of American Railroads. Railroad Committee for the Study of Transportation. (1940). The economics of weight reduction in freight carrying railroad cars.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Association of American Railroads. Railroad Committee for the Study of Transportation. The Economics of Weight Reduction in Freight Carrying Railroad Cars. [Washington?, 1940.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Association of American Railroads. Railroad Committee for the Study of Transportation. The Economics of Weight Reduction in Freight Carrying Railroad Cars. 1940.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.