APA Style
GIESEN, W. (1991).
Karang Gading-Langkat Timur Laut (North Sumatra): survey report .
:
Asian Wetland Bureau-Indonesia.
MLA Style
GIESEN, Wim.
"Karang Gading-Langkat Timur Laut (North Sumatra): survey report".
:
Asian Wetland Bureau-Indonesia,
1991.
Electronic resources.