Gaya APA

OYEN, L, ;, D, N, X. (1999). Plant Resources of South-East Asia No. 19 : Essential oil plants . : Prosea.

Gaya MLA

OYEN, L.P.A., ;, DUNG,, Nguyen, Xuan. "Plant Resources of South-East Asia No. 19 : Essential oil plants". : Prosea, 1999. Buku.