APA (7th ed.) Citation

Gray, H. P. (1976). A generalized theory of international trade. Macmillan.

Chicago Style (17th ed.) Citation

Gray, H Peter. A Generalized Theory of International Trade. London: Macmillan, 1976.

MLA (9th ed.) Citation

Gray, H Peter. A Generalized Theory of International Trade. Macmillan, 1976.