Enriquez, R. G. (1976). A trilingual study of language skills in Pampango, Pilipino and English of Grade III pupils from the urban and rural schools [microform]. Photoduplication Service, University of the Philippines Library.

Enriquez, Rosita G. A Trilingual Study of Language Skills in Pampango, Pilipino and English of Grade III Pupils from the Urban and Rural Schools [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1976.

Enriquez, Rosita G. A Trilingual Study of Language Skills in Pampango, Pilipino and English of Grade III Pupils from the Urban and Rural Schools [microform]. Photoduplication Service, University of the Philippines Library, 1976.