Sunday-schools the world around; the official report of the World's fifth Sunday-school convention in Rome, May 18-23, 1907
World-wide Sunday-school work; the official report of the World's sixth Sunday-school convention, held in the city of Washington, U.S.A., May 19-24, 1910
World-wide Sunday-school work; the official report of the World's seventh Sunday-school convention, held in Zurich, Switzerland, July 8-15, 1913