Wallop Promthong. 1995. Farmer's utilization of tobacco production technology and the perceived health consequences in Phetchabun province, ThailandWallop Promthong. Faculty of Graduate School, University of Philippines Los Banos;
Wallop Promthong. (1995) Farmer's utilization of tobacco production technology and the perceived health consequences in Phetchabun province, ThailandWallop Promthong . University of Philippines Los Banos/Los Banos.
Wallop Promthong. Farmer's utilization of tobacco production technology and the perceived health consequences in Phetchabun province, ThailandWallop Promthong. . Los Banos:University of Philippines Los Banos, 1995.
Wallop Promthong. (1995) Farmer's utilization of tobacco production technology and the perceived health consequences in Phetchabun province, ThailandWallop Promthong . University of Philippines Los Banos/Los Banos.