Nassara Hongron. 2005. A study of training process in direct selling business. Field of Study Adult and Continuing Education, Mahidol University;
Nassara Hongron. (2005) A study of training process in direct selling business . Mahidol University/Bangkok.
Nassara Hongron. A study of training process in direct selling business. . Bangkok:Mahidol University, 2005.
Nassara Hongron. (2005) A study of training process in direct selling business . Mahidol University/Bangkok.