APA

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

Chicago

Beth Thomas, Jungnickel Dieter and Lenz Hanfried. 1999. Design theory. Cambridge: Cambridge University Press.

Harvard

Beth T., Jungnickel D. and Lenz H. (1999). Design theory. Cambridge: Cambridge University Press.

MLA

Beth Thomas, Jungnickel Dieter and Lenz Hanfried. Design theory. Cambridge: Cambridge University Press. 1999.