Citazione APA

Willging, E. P. (1937). The Index to American Catholic pamphlets. Catholic Library Service.

Stile di citazione Chicago

Willging, Eugene P. The Index to American Catholic Pamphlets. [Saint Paul, Minn.: Catholic Library Service, 1937.

Citazione MLA

Willging, Eugene P. The Index to American Catholic Pamphlets. Catholic Library Service, 1937.