Valdes, J. D. (1979). A survey of the principals, teachers, superiors' attitude towards the selection and tenure policies governing religious high school principals [microform]. Photoduplication Service, University of the Philippines Library.
Chicago-viite (17. p.)Valdes, Joseline D. A Survey of the Principals, Teachers, Superiors' Attitude Towards the Selection and Tenure Policies Governing Religious High School Principals [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1979.
MLA-viite (9. p.)Valdes, Joseline D. A Survey of the Principals, Teachers, Superiors' Attitude Towards the Selection and Tenure Policies Governing Religious High School Principals [microform]. Photoduplication Service, University of the Philippines Library, 1979.