Wanpen Moonsuwan. (2016) Manager and Four principles virtuous existence. <i>Journal of Management Science Nakhon Pathom Rajabhat University</i>, <i>3</i>(1), 102-108.Wanpen Moonsuwan. "Manager and Four principles virtuous existence". Journal of Management Science Nakhon Pathom Rajabhat University 3 (2016):102-108.Wanpen Moonsuwan. Manager and Four principles virtuous existence. Faculty of Management Science Nakhon Pathom Rajabhat University:ม.ป.ท. 2016.