APA-referens (7:e uppl.)
Conference on the National Archives and Research in Historical Geography ( Washington, EUA), & Ehrenberg, R. E. Pattern and Process: V. 9 : Research in Historical Geography. Howard University Press.
Chicago-referens (17:e uppl.)
Conference on the National Archives and Research in Historical Geography ( Washington, EUA), och Ralph E. Ehrenberg. Pattern and Process: V. 9 : Research in Historical Geography. Washington, EUA: Howard University Press.
MLA-referens (9:e uppl.)
Conference on the National Archives and Research in Historical Geography ( Washington, EUA), och Ralph E. Ehrenberg. Pattern and Process: V. 9 : Research in Historical Geography. Howard University Press.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.