APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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