Gaya APA
Oyen, L., Dung, N, X. (1999).
Plant Resources of South-East Asia 19 Essential-oil Plants .
Bogor:
Prosea Indonesia.
Gaya MLA
Oyen, L.P.A.., Dung, Nguyen, Xuan.
"Plant Resources of South-East Asia 19 Essential-oil Plants".
Bogor:
Prosea Indonesia,
1999.
HandBook.