Diaz, P. S. (1974). A study of the common errors in Pilipino theme writing committed by the elementary pupils of Baybay District I Leyte III in 1966-1967 [microform]. Photoduplication Service, University of the Philippines Library.
Cytowanie według stylu Chicago (wyd. 17)Diaz, Presentacion S. A Study of the Common Errors in Pilipino Theme Writing Committed by the Elementary Pupils of Baybay District I Leyte III in 1966-1967 [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1974.
Cytowanie według stylu MLA (wyd. 9)Diaz, Presentacion S. A Study of the Common Errors in Pilipino Theme Writing Committed by the Elementary Pupils of Baybay District I Leyte III in 1966-1967 [microform]. Photoduplication Service, University of the Philippines Library, 1974.