Ryan, A. L. 1. (1974). Religious education in the Philippines: A study of the organization and activities of Philippine Islands Sunday School Union, now the Philippine Council of Religious education. Photoduplication Service,University of the Philippines Library.
Cita Chicago (17th ed.)Ryan, Archie Lowell 1881. Religious Education in the Philippines: A Study of the Organization and Activities of Philippine Islands Sunday School Union, Now the Philippine Council of Religious Education. Quezon City: Photoduplication Service,University of the Philippines Library, 1974.
Cita MLA (9th ed.)Ryan, Archie Lowell 1881. Religious Education in the Philippines: A Study of the Organization and Activities of Philippine Islands Sunday School Union, Now the Philippine Council of Religious Education. Photoduplication Service,University of the Philippines Library, 1974.