Gaya APA

SIANTURI, A. (1990). An optimal harvesting model to evaluate the Indonesian selective cutting system for secondary dipterocarp forests . Ann Arbor: U.M.I.

Gaya MLA

SIANTURI, Apul. "An optimal harvesting model to evaluate the Indonesian selective cutting system for secondary dipterocarp forests". Ann Arbor: U.M.I, 1990. Buku.