APA Style
dkk, ., Anwar, J.
(1984).
Ekologi Ekosistem Sumatera
.
Yogyakarta:
Gadjah Mada University Press.
MLA Style
dkk, ., Anwar, Jazanul.
"Ekologi Ekosistem Sumatera".
Yogyakarta:
Gadjah Mada University Press,
1984.
Text.