Caldera, L. H. (1976). Proposed methods in the teaching of Spanish in secondary schools and colleges in the Bicol Region [microform]. Photoduplication Service. University of the Philippines Library.
Chicago-referens (17:e uppl.)Caldera, Leticia H. Proposed Methods in the Teaching of Spanish in Secondary Schools and Colleges in the Bicol Region [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1976.
MLA-referens (9:e uppl.)Caldera, Leticia H. Proposed Methods in the Teaching of Spanish in Secondary Schools and Colleges in the Bicol Region [microform]. Photoduplication Service. University of the Philippines Library, 1976.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.