Gaya APA
Siagian, R., Djamal, N. ().
1830 - 2012 Evolution and Chronicle Plantation in Indonesia .
Yogyakarta:
Yayasan Cempaka Kencana.
Gaya MLA
Siagian, Renville., Djamal, Naswin.
"1830 - 2012 Evolution and Chronicle Plantation in Indonesia".
Yogyakarta:
Yayasan Cempaka Kencana,
.
Text.