Perpustakaan UGM, i. (1998). Direction of soil conservation as A way of conserving the capability of the environment. [Yogyakarta] : Universitas Gadjah Mada.
استشهاد بنمط شيكاغوPerpustakaan UGM, i-lib. Direction of Soil Conservation As A Way of Conserving the Capability of the Environment. [Yogyakarta] : Universitas Gadjah Mada, 1998.
MLA استشهادPerpustakaan UGM, i-lib. Direction of Soil Conservation As A Way of Conserving the Capability of the Environment. [Yogyakarta] : Universitas Gadjah Mada, 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.