APA-referens (7:e uppl.)

Gould, L. L. (1974). The progressive era. Syracuse University Press.

Chicago-referens (17:e uppl.)

Gould, Lewis L. The Progressive Era. Syracuse, N.Y: Syracuse University Press, 1974.

MLA-referens (9:e uppl.)

Gould, Lewis L. The Progressive Era. Syracuse University Press, 1974.