Davis, V. L. A survey of health education in Grade six of Bulacan province [microform]. Photoduplication Service.
Chicago-referens (17:e uppl.)Davis, Velma Lou. A Survey of Health Education in Grade Six of Bulacan Province [microform]. Quezon City: Photoduplication Service.
MLA-referens (9:e uppl.)Davis, Velma Lou. A Survey of Health Education in Grade Six of Bulacan Province [microform]. Photoduplication Service.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.