Gaya APA

Piliang, W, G., Lukman, I, R. (NULL). Proceeding symposium forest resources, biological resources and concervation . Bogor:: Bogor: IPB; 1990.

Gaya MLA

Piliang, Wiranda, G.., Lukman, I., Rahardja,. "Proceeding symposium forest resources, biological resources and concervation". Bogor:: Bogor: IPB; 1990, NULL. Text.