APA (7th ed.) Citation

Hughes, D. R., & Piper, F. C. (1985). Design theory. Cambridge University Press. https://doi.org/10.1017/CBO9780511566066

Chicago Style (17th ed.) Citation

Hughes, D. R., and F. C. Piper. Design Theory. Cambridge: Cambridge University Press, 1985. https://doi.org/10.1017/CBO9780511566066.

MLA (9th ed.) Citation

Hughes, D. R., and F. C. Piper. Design Theory. Cambridge University Press, 1985. https://doi.org/10.1017/CBO9780511566066.