Pham และผู้แต่งคนอื่นๆ. 2004. Socio-economic characteristics affecting people's willingness to pay for HIV. Field of Study Health Economics, Chulalongkorn University;
Pham และผู้แต่งคนอื่นๆ. (2004) Socio-economic characteristics affecting people's willingness to pay for HIV . Chulalongkorn University/Bangkok.
Pham และผู้แต่งคนอื่นๆ. Socio-economic characteristics affecting people's willingness to pay for HIV. . Bangkok:Chulalongkorn University, 2004.
Pham และผู้แต่งคนอื่นๆ. (2004) Socio-economic characteristics affecting people's willingness to pay for HIV . Chulalongkorn University/Bangkok.