Philippines. Department of Science and Technology. Philippines Center for Advanced Science and Technology Research and Development. PCARRD Online: PCARRD home page.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippines. Department of Science and Technology. Philippines Center for Advanced Science and Technology Research and Development. PCARRD Online: PCARRD Home Page.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Philippines. Department of Science and Technology. Philippines Center for Advanced Science and Technology Research and Development. PCARRD Online: PCARRD Home Page.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.