1. The Development of Reference Services; through Academic Traditions, Public Library Practice and Special Librarianship;Rothstein,1955
2. Rothstein, Samuel. “The Development of the Concept of Reference Service in American Libraries, 1850–1900.”;The Library Quarterly,1953
3. The Growth of Reference Service in the United States from 1876 to 1893;Kaplan,1952
4. Adams, E.M., Jr. A Study of Reference Librarianship in the American College, 1876–1955. Unpublished M.S. thesis, East Texas State Teachers College, 1956.
5. and Singleton, Mildred E. Reference Teaching in the Pioneer Library School, 1883–1903. Unpublished M.S. thesis, Columbia University, 1942.