APA (7th ed.) Citation

Hughes, D. R., & Piper, F. C. (1985). Design theory. Cambridge University Press.

Chicago Style (17th ed.) Citation

Hughes, D. R., and F. C. Piper. Design Theory. Cambridge: Cambridge University Press, 1985.

MLA (9th ed.) Citation

Hughes, D. R., and F. C. Piper. Design Theory. Cambridge University Press, 1985.