Cita APA

Hopkins, A. L. (1943). Periscope peeks at the world above. Our Sunday Visitor.

Citación estilo Chicago

Hopkins, A. L. Periscope Peeks at the World Above. Huntington, Ind.: Our Sunday Visitor, 1943.

Cita MLA

Hopkins, A. L. Periscope Peeks at the World Above. Our Sunday Visitor, 1943.