Cita APA (7th ed.)

Kirby, G., & Goodpaster, J. R. (1999). Thinking (2nd ed.). Prentice Hall.

Cita Chicago (17th ed.)

Kirby, Gary, i Jeffrey R. Goodpaster. Thinking. 2nd ed. Upper Saddle River, N.J: Prentice Hall, 1999.

Cita MLA (9th ed.)

Kirby, Gary, i Jeffrey R. Goodpaster. Thinking. 2nd ed. Prentice Hall, 1999.