Gerrits, R. (1996). The Philippine government's approach to upland development: Integrated social forestry program. SEAMEO Regional Center for Graduate Study and Research in Agriculture.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gerrits, R.V. The Philippine Government's Approach to Upland Development: Integrated Social Forestry Program. Los Baños, Laguna: SEAMEO Regional Center for Graduate Study and Research in Agriculture, 1996.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Gerrits, R.V. The Philippine Government's Approach to Upland Development: Integrated Social Forestry Program. SEAMEO Regional Center for Graduate Study and Research in Agriculture, 1996.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.