Gaya APA

Hisyam, N. 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.