Rimban, L. R. (1975). The weaknesses of the Grade Six pupils of Sablan District, Benguet Division in the study of rational numbers during the school year 1969-1970 [microform]. Photoduplication Service, University of the Philippines Library.

Rimban, Laurentino R. The Weaknesses of the Grade Six Pupils of Sablan District, Benguet Division in the Study of Rational Numbers During the School Year 1969-1970 [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1975.

Rimban, Laurentino R. The Weaknesses of the Grade Six Pupils of Sablan District, Benguet Division in the Study of Rational Numbers During the School Year 1969-1970 [microform]. Photoduplication Service, University of the Philippines Library, 1975.