APA-referens (7:e uppl.)

Halko, J. (1950). Religious census, District of Columbia: General summary. Washington Federation of Churches.

Chicago-referens (17:e uppl.)

Halko, John. Religious Census, District of Columbia: General Summary. Washington, D.C.: Washington Federation of Churches, 1950.

MLA-referens (8:e uppl.)

Halko, John. Religious Census, District of Columbia: General Summary. Washington Federation of Churches, 1950.