Gaya APA

TOBING, D, H. (1968). A preliminary bibliography on fauna, flora, vegetation conservation of nature and natural resource of Sumatra . Nature Conservation Department: Wageningen.

Gaya MLA

TOBING, Drwin, Halim. "A preliminary bibliography on fauna, flora, vegetation conservation of nature and natural resource of Sumatra". Nature Conservation Department: Wageningen, 1968. Buku.