Penrose, E. T. (1951). The economics of the international patent system. Johns Hopkins Press.
芝加哥风格引文Penrose, Edith Tilton. The Economics of the International Patent System. Baltimore: Johns Hopkins Press, 1951.
MLA引文Penrose, Edith Tilton. The Economics of the International Patent System. Johns Hopkins Press, 1951.
警告：这些引文格式不一定是100％准确.