Gaya APA
Oyen, L., Dung, N, X. (1999).
Plant Resources of South - East Asia 19 - Essential- oil plants .
The Netherland:
Backhuys ublishers.
Gaya MLA
Oyen, L.P.A.., Dung, Nguyrn, Xuan.
"Plant Resources of South - East Asia 19 - Essential- oil plants".
The Netherland:
Backhuys ublishers,
1999.
Text.