Pius XI, P., & Loeffler, J. D. (1938). Directives for Catholic action: Expounded by Pope Pius XI ; with indulgences for those enrolled in Catholic action. Central Bureau Press.
Čikaški stil citiranja (17. izdanje)Pius XI, Pope, i James D. Loeffler. Directives for Catholic Action: Expounded by Pope Pius XI ; with Indulgences for Those Enrolled in Catholic Action. St. Louis, Mo.: Central Bureau Press, 1938.
MLA način citiranja (8. izdanje)Pius XI, Pope, i James D. Loeffler. Directives for Catholic Action: Expounded by Pope Pius XI ; with Indulgences for Those Enrolled in Catholic Action. Central Bureau Press, 1938.
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