Grengia, E. M. (1979). Soil-cement: Its structural characteristics and suitability as a low-cost housing material [microform]. Photoduplication Service. University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Grengia, Epifanio M. Soil-cement: Its Structural Characteristics and Suitability as a Low-cost Housing Material [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1979.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Grengia, Epifanio M. Soil-cement: Its Structural Characteristics and Suitability as a Low-cost Housing Material [microform]. Photoduplication Service. University of the Philippines Library, 1979.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.