APA-referens (7:e uppl.)

Duffy, A. (1936). The poetry of duty. National Council of Catholic Men.

Chicago-referens (17:e uppl.)

Duffy, Alfred. The Poetry of Duty. Washington, D.C.: National Council of Catholic Men, 1936.

MLA-referens (8:e uppl.)

Duffy, Alfred. The Poetry of Duty. National Council of Catholic Men, 1936.