APA-referens (7:e uppl.)

Popenoe, D. (1969). The urban-industrial frontier; essays on social trends and institutional goals in modern communities. Rutgers University Press.

Chicago-referens (17:e uppl.)

Popenoe, David. The Urban-industrial Frontier; Essays on Social Trends and Institutional Goals in Modern Communities. New Brunswick, N.J: Rutgers University Press, 1969.

MLA-referens (9:e uppl.)

Popenoe, David. The Urban-industrial Frontier; Essays on Social Trends and Institutional Goals in Modern Communities. Rutgers University Press, 1969.