APA (7th ed.) Citation

Gray, J. A. (1975). Elements of a two-process theory of learning. Academic Press.

Chicago Style (17th ed.) Citation

Gray, Jeffrey Alan. Elements of a Two-process Theory of Learning. London [etc.]: Academic Press, 1975.

MLA (9th ed.) Citation

Gray, Jeffrey Alan. Elements of a Two-process Theory of Learning. Academic Press, 1975.