Cita APA (7a ed.)

Keil, F. C. (1992). Concepts, kinds, and cognitive development. MIT.

Cita Chicago Style (17a ed.)

Keil, Frank C. Concepts, Kinds, and Cognitive Development. Cambridge (Massachusetts): MIT, 1992.

Cita MLA (9a ed.)

Keil, Frank C. Concepts, Kinds, and Cognitive Development. MIT, 1992.