Burritt, C. M. (1976). Complete list of Spanish mining claims recorded in the Mining Bureau [microform]. Photoduplication Service. University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Burritt, Charles M. Complete List of Spanish Mining Claims Recorded in the Mining Bureau [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1976.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Burritt, Charles M. Complete List of Spanish Mining Claims Recorded in the Mining Bureau [microform]. Photoduplication Service. University of the Philippines Library, 1976.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.