APA-referens (7:e uppl.)

Day, C. (1925). History of commerce of the United States. Longmans, Green and Co..

Chicago-referens (17:e uppl.)

Day, Clive. History of Commerce of the United States. New York [etc.]: Longmans, Green and Co., 1925.

MLA-referens (8:e uppl.)

Day, Clive. History of Commerce of the United States. Longmans, Green and Co., 1925.