Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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