Gaya APA
Suryanti, N.
(1969).
Oil and people in Sumatra's jungle.
.
Dumai:
Dumai PT Caltex Pacific.
Gaya MLA
Suryanti, Nora.
"Oil and people in Sumatra's jungle. ".
Dumai:
Dumai PT Caltex Pacific,
1969.
Buku.