APA (7th ed.) Citation

Beth, T., Jungnickel, D., & Lenz, H. (1999). Design theory (2nd ed.). Cambridge University Press.

Chicago Style (17th ed.) Citation

Beth, Thomas, D. Jungnickel, and Hanfried Lenz. Design Theory. 2nd ed. Cambridge, U.K. ; New York: Cambridge University Press, 1999.

MLA (9th ed.) Citation

Beth, Thomas, et al. Design Theory. 2nd ed. Cambridge University Press, 1999.