Nazaruddin, H. et al.(1984).Ekologi ekosistem Sumatera / Jazanul Anwar, Sengli J. Damanik, Nazaruddin Hisyam .Medan:Gadjah Mada University Press.
Gaya MLA
Hisyam, Nazaruddin. et al."Ekologi ekosistem Sumatera / Jazanul Anwar, Sengli J. Damanik, Nazaruddin Hisyam".Medan:Gadjah Mada University Press,1984.Textbook.