à¹€à¸žà¸µà¸¢à¸£à¹€à¸ˆà¸£à¸´à¸, à., & à¸ªà¸¸à¸„à¸™à¹€à¸‚à¸•à¸£à¹Œ, à. 2012 Apr 1. à¸à¸²à¸£à¸¨à¸¶à¸à¸©à¸²à¸”à¸¹à¸‡à¸²à¸™à¸ à¸²à¸„à¹€à¸«à¸™à¸·à¸ à¸•à¸à¸™à¸—à¸µà¹ˆ à¹‘. 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] 23:1