Sugandi, A. (2005). Characterisation, Classification and Suitability for Oil Palm of Some Common Soils in Tawau-Semporna Area, Sabah.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sugandi, Arif. Characterisation, Classification and Suitability for Oil Palm of Some Common Soils in Tawau-Semporna Area, Sabah. 2005.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sugandi, Arif. Characterisation, Classification and Suitability for Oil Palm of Some Common Soils in Tawau-Semporna Area, Sabah. 2005.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.