Nopparat Viriyapas. 2010. The trend of regional disparities and income inequality in Thailand : a case study of Thailand from 1981 to 2007. Faculty of Business Administration, Ramkhamhaeng University;
Nopparat Viriyapas. (2010) The trend of regional disparities and income inequality in Thailand : a case study of Thailand from 1981 to 2007 . Ramkhamhaeng University/Bangkok.
Nopparat Viriyapas. The trend of regional disparities and income inequality in Thailand : a case study of Thailand from 1981 to 2007. . Bangkok:Ramkhamhaeng University, 2010.
Nopparat Viriyapas. (2010) The trend of regional disparities and income inequality in Thailand : a case study of Thailand from 1981 to 2007 . Ramkhamhaeng University/Bangkok.