APA-referens (7:e uppl.)

Willoughby, W. W. (1910). The rights and duties of American citizenship. American Book Co..

Chicago-referens (17:e uppl.)

Willoughby, Westel Woodbury. The Rights and Duties of American Citizenship. New York : Cincinnati [etc.]: American Book Co., 1910.

MLA-referens (8:e uppl.)

Willoughby, Westel Woodbury. The Rights and Duties of American Citizenship. American Book Co., 1910.