Duffy, A. (1936). The poetry of duty. National Council of Catholic Men.
Chicagoスタイル(17版)引用形式Duffy, Alfred. The Poetry of Duty. Washington, D.C.: National Council of Catholic Men, 1936.
MLA(8版)引用形式Duffy, Alfred. The Poetry of Duty. National Council of Catholic Men, 1936.
警告: この引用は必ずしも正確ではありません.