Philippines (Republic). Board of Technical Surveys and Maps. (1960). Report on the status of surveying and mapping activities in the Philippines. s.n.].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippines (Republic). Board of Technical Surveys and Maps. Report on the Status of Surveying and Mapping Activities in the Philippines. [Manila: s.n.], 1960.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Philippines (Republic). Board of Technical Surveys and Maps. Report on the Status of Surveying and Mapping Activities in the Philippines. s.n.], 1960.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.