APA (7th ed.) Citation

Newell, A. (1990). Unified theories of cognition. Harvard University Press.

Chicago Style (17th ed.) Citation

Newell, Allen. Unified Theories of Cognition. Cambridge [Mass.] [etc.]: Harvard University Press, 1990.

MLA (9th ed.) Citation

Newell, Allen. Unified Theories of Cognition. Harvard University Press, 1990.

Warning: These citations may not always be 100% accurate.