APA Style

Oyen, L., Dung, N, X. (1999). Plant Resources Of South-East Asia 19: Essential-Oil Plants . Bogor: Prosea.

MLA Style

Oyen, L.P.A., Dung, Nguyen, Xuan. "Plant Resources Of South-East Asia 19: Essential-Oil Plants". Bogor: Prosea, 1999. Text.