APA (7th ed.) Citation

Colgan, H. V. (1941). Devotions under the flag: A prayer book for Catholic men in every branch of the service. Catholic Publications Press.

Chicago Style (17th ed.) Citation

Colgan, H. V. Devotions Under the Flag: A Prayer Book for Catholic Men in Every Branch of the Service. New York: Catholic Publications Press, 1941.

MLA (8th ed.) Citation

Colgan, H. V. Devotions Under the Flag: A Prayer Book for Catholic Men in Every Branch of the Service. Catholic Publications Press, 1941.