à¹€à¸ˆà¸µà¸¢à¸¡à¸ˆà¸´à¸•à¸•à¹Œà¸•à¸£à¸‡, à., à¸¨à¸£à¸µà¸§à¸‡à¸©à¹Œà¸„à¸¥, à., & à¸™à¸´à¸¥à¸ªà¸¸à¸‚, à. 2007 Aug 1. à¹€à¸—à¸„à¹‚à¸™à¹‚à¸¥à¸¢à¸µà¸à¸±à¸šà¸à¸²à¸£à¸ˆà¸±à¸”à¸à¸²à¸£à¸„à¸§à¸²à¸¡à¸£à¸¹à¹‰à¹ƒà¸™à¸à¸‡à¸„à¹Œà¸à¸£. à¸§à¸²à¸£à¸ªà¸²à¸£à¸§à¸´à¸—à¸¢à¸šà¸£à¸´à¸à¸²à¸£ à¸¡à¸«à¸²à¸§à¸´à¸—à¸¢à¸²à¸¥à¸±à¸¢à¸ªà¸‡à¸‚à¸¥à¸²à¸™à¸„à¸£à¸´à¸™à¸—à¸£à¹Œ | Academic Services Journal, Prince of Songkla University. [Online] 18:2