Gaya APA

Suharta, B, H, P, A, N. (). Genesis and properties of peat at Toba Higland area of north Sumatra . : .

Gaya MLA

Suharta, Bambang, Hendro, Prasetyo,, And, Nata. "Genesis and properties of peat at Toba Higland area of north Sumatra ". : , . .