APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Hughes, Daniel R., and Frederick C. Piper. Design Theory. Cambridge u.a: Cambridge Univ. Press, 1985.

MLA (9th ed.) Citation

Hughes, Daniel R., and Frederick C. Piper. Design Theory. Cambridge Univ. Press, 1985.