United States. Bureau of the Census & United States. National Archives and Records Administration. (1990). 14th census of population, 1920. National Archives and Records Administration ; Available from Scholarly Resources Inc..
Lua i Stíl Chicago (17ú heag.)United States. Bureau of the Census agus United States. National Archives and Records Administration. 14th Census of Population, 1920. Washington : Wilmington, DE: National Archives and Records Administration ; Available from Scholarly Resources Inc., 1990.
Lua MLA (8ú heag.)United States. Bureau of the Census agus United States. National Archives and Records Administration. 14th Census of Population, 1920. National Archives and Records Administration ; Available from Scholarly Resources Inc., 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.