Salvador, E. C. (1979). An analysis of the attendance and dropouts of the public elementary school pupils in the Division of Isabela for the school years 1965-66 to 1969-70 [microform]. Photoduplication Service, University of the Philippines Library.
芝加哥风格引文Salvador, Estelita Cristobal. An Analysis of the Attendance and Dropouts of the Public Elementary School Pupils in the Division of Isabela for the School Years 1965-66 to 1969-70 [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1979.
MLA引文Salvador, Estelita Cristobal. An Analysis of the Attendance and Dropouts of the Public Elementary School Pupils in the Division of Isabela for the School Years 1965-66 to 1969-70 [microform]. Photoduplication Service, University of the Philippines Library, 1979.