Ocampo และผู้แต่งคนอื่นๆ. 1991. Comparative analysis of non-participating and participating farmers under the corn productivity enhancement program in the province of Bukidnon, Philippines, 1990. Graduate School, Kasetsart University;
Ocampo และผู้แต่งคนอื่นๆ. (1991) Comparative analysis of non-participating and participating farmers under the corn productivity enhancement program in the province of Bukidnon, Philippines, 1990 . Kasetsart University/Bankgok.
Ocampo และผู้แต่งคนอื่นๆ. Comparative analysis of non-participating and participating farmers under the corn productivity enhancement program in the province of Bukidnon, Philippines, 1990. . Bankgok:Kasetsart University, 1991.
Ocampo และผู้แต่งคนอื่นๆ. (1991) Comparative analysis of non-participating and participating farmers under the corn productivity enhancement program in the province of Bukidnon, Philippines, 1990 . Kasetsart University/Bankgok.