Παραπομπή σε μορφή APA (7η εκδ.)

Guttenberg, A. Z., & Hopkins, L. D. (1993). The language of planning: Essays on the origins and ends of American planning thought. University of Illinois Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Guttenberg, Albert Z., και Lewis D. Hopkins. The Language of Planning: Essays on the Origins and Ends of American Planning Thought. Urbana, Ill: University of Illinois Press, 1993.

Παραπομπή σε μορφή MLA (9th εκδ.)

Guttenberg, Albert Z., και Lewis D. Hopkins. The Language of Planning: Essays on the Origins and Ends of American Planning Thought. University of Illinois Press, 1993.