Gaya APA
SUSMIANTO, A. (1995).
Recreational expenditures in Gede Pangrango National Park and their regional economic impacts .
Michigan:
UMI.
Gaya MLA
SUSMIANTO, Adi.
"Recreational expenditures in Gede Pangrango National Park and their regional economic impacts".
Michigan:
UMI,
1995.
Buku.