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3. Beyer, C. H., Gillmore, G., & Fisher, A. (2007). Inside the Undergraduate Experience: The University of Washington's Study of Undergraduate Learning. Bolton, MA: Anker Press.
4. Council of Presidents and State Board for Community College Education (1989). "The validity and usefulness of three national standardized tests for measuring communication, computation, and critical thinking skills of Washington State college sophomores." Bellingham, WA: Western Washington University Office of Publications.
5. Donald, J. G. (2002). Learning to think: Disciplinary perspectives. San Francisco: Jossey-Bass.