Citazione Stile APA (7a Edizione)

Villanueva, T. R. (2005). Upland ecosystem management (2nd ed.). University of the Philippines Open University.

Citazione stile Chigago Style (17a edizione)

Villanueva, Teodoro R. Upland Ecosystem Management. 2nd ed. Quezon City: University of the Philippines Open University, 2005.

Citatione MLA (9a ed.)

Villanueva, Teodoro R. Upland Ecosystem Management. 2nd ed. University of the Philippines Open University, 2005.