Perez, A. G. (1975). The development among slow learners in grade two through continuous progressive scheme at the Rosario Central School, Rosario, La Union [microform]. Photoduplication Service, University of the Philippines Library.

Perez, Avelina G. The Development Among Slow Learners in Grade Two Through Continuous Progressive Scheme at the Rosario Central School, Rosario, La Union [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1975.

Perez, Avelina G. The Development Among Slow Learners in Grade Two Through Continuous Progressive Scheme at the Rosario Central School, Rosario, La Union [microform]. Photoduplication Service, University of the Philippines Library, 1975.