Pius XI: Apostle of Peace, by Lillian Browne-Olf
- Book I - Development
- Book II - Fulfillment
- The text for these pages is taken from the book Pius XI: Apostle of Peace, by Lillian Browne-Olf, published in New York in April 1938.
- It has the Imprimatur of Cardinal Patrick Joseph Hayes, Archdiocese of New York, New York, 9 February 1938.
- The cover image is a portrait of Pope Pius XI, artist unknown, painted in 1922.