Philippines (Republic) National Science Development Board. Office of International Science Relations & Philippine Academy of Sciences and Humanities. (1973). The Philippine Academy of Sciences and Hmanities [microform]. Photoduplication Service.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippines (Republic) National Science Development Board. Office of International Science Relations و Philippine Academy of Sciences and Humanities. The Philippine Academy of Sciences and Hmanities [microform]. Quezon City: Photoduplication Service, 1973.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Philippines (Republic) National Science Development Board. Office of International Science Relations و Philippine Academy of Sciences and Humanities. The Philippine Academy of Sciences and Hmanities [microform]. Photoduplication Service, 1973.