Villason, N. A., & Olguera, D. T. (2020). Physico-chemical characteristics of soils under cacao production system in Davao de Oro, Philippines134. Southeastern Philippines Journal of Research and Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Villason, Nelvin A., و Dernie T. Olguera. "Physico-chemical Characteristics of Soils Under Cacao Production System in Davao De Oro, Philippines134." Southeastern Philippines Journal of Research and Development 2020.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Villason, Nelvin A., و Dernie T. Olguera. "Physico-chemical Characteristics of Soils Under Cacao Production System in Davao De Oro, Philippines134." Southeastern Philippines Journal of Research and Development, 2020.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.