APA (7th ed.) Citation

Penrose, E. T. (1951). The economics of the international patent system. John Hopkins Press.

Chicago Style (17th ed.) Citation

Penrose, Edith Tilton. The Economics of the International Patent System. Baltimore: John Hopkins Press, 1951.

MLA (9th ed.) Citation

Penrose, Edith Tilton. The Economics of the International Patent System. John Hopkins Press, 1951.