APA-referens (7:e uppl.)

Park, R. E. (1952). Human communities: The city and human ecology. Free Press.

Chicago-referens (17:e uppl.)

Park, Robert Ezra. Human Communities: The City and Human Ecology. Glencoe, Ill: Free Press, 1952.

MLA-referens (9:e uppl.)

Park, Robert Ezra. Human Communities: The City and Human Ecology. Free Press, 1952.