Boonbandan Yuvanasiri และผู้แต่งคนอื่นๆ. (1997) Effect of exploration block ringfencing concept to the return on investment of petroleum concessionaire in Thailand. Chulalongkorn University.:ม.ป.ท.Boonbandan Yuvanasiri และผู้แต่งคนอื่นๆ. 1997. Effect of exploration block ringfencing concept to the return on investment of petroleum concessionaire in Thailand. ม.ป.ท.:Chulalongkorn University.;Boonbandan Yuvanasiri และผู้แต่งคนอื่นๆ. Effect of exploration block ringfencing concept to the return on investment of petroleum concessionaire in Thailand. ม.ป.ท.:Chulalongkorn University. 1997. Print.