APA-referens (7:e uppl.)
Engs, R. C. (2003). The progressive era's health reform movement: A historical dictionary. Praeger.
Chicago-referens (17:e uppl.)
Engs, Ruth Clifford. The Progressive Era's Health Reform Movement: A Historical Dictionary. Westport, CT: Praeger, 2003.
MLA-referens (9:e uppl.)
Engs, Ruth Clifford. The Progressive Era's Health Reform Movement: A Historical Dictionary. Praeger, 2003.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.