Soong, N. (1970). A study of the root distribution of Hevea brasiliensis in relation to its nutrition and growth on some typical Malayan soils.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Soong, Ngin-kwi. A Study of the Root Distribution of Hevea Brasiliensis in Relation to Its Nutrition and Growth on Some Typical Malayan Soils. 1970.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Soong, Ngin-kwi. A Study of the Root Distribution of Hevea Brasiliensis in Relation to Its Nutrition and Growth on Some Typical Malayan Soils. 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.