Philippines. Department of Public Works, Transportation and Communications, & Planning and Project Development Office. (1972). Pre-feasibility study: Marikina-Infanta road. PPDO.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippines. Department of Public Works, Transportation and Communications, و Planning and Project Development Office. Pre-feasibility Study: Marikina-Infanta Road. Manila: PPDO, 1972.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Philippines. Department of Public Works, Transportation and Communications, و Planning and Project Development Office. Pre-feasibility Study: Marikina-Infanta Road. PPDO, 1972.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.