Hartley, J. (1996). Text design. In D. H. Jonassen, ed. Handbook of research for educational communications and technology. New York, NY: Simon & Schuster Macmillan.
Lohr, L. (In press). Creating visuals for learning and performance: lessons in visual literacy. Prentice-Hall.
Mullet, K. & Sanyo, D. (1995). Designing visual interfaces: communication oriented techniques. Englewood Cliffs, NJ: Prentice Hall PTR.
Ormrod, J. (1999). Human learning (3rd ed.). Upper Saddle River, NJ: Prentice Hall.
Tufte, E. R. (1990). Envisioning information. Graphics Press.
Warde, B. (1956). The crystal goblet or printing should be invisible." From The crystal goblet, sixteen essays on typography. Cleveland.
Williams, R. (1994). The non-designer's design book. Berkeley, CA: Peachpit Press.