Gaya APA
VRIES, E, D.
(1970).
The agro-economic survey in Indonesia 1965-1968
.
[s.n]:
The Hague [etc.].
Gaya MLA
VRIES, E., De.
"The agro-economic survey in Indonesia 1965-1968".
[s.n]:
The Hague [etc.],
1970.
Buku.