Philippines Islands. Laws, statutes, etc. (1977). Laws and regulations governing petroleum lands [microform]. Photoduplication Service, University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippines Islands. Laws, statutes, etc. Laws and Regulations Governing Petroleum Lands [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1977.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Philippines Islands. Laws, statutes, etc. Laws and Regulations Governing Petroleum Lands [microform]. Photoduplication Service, University of the Philippines Library, 1977.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.