Yuttasak Arakkitsakul. 2008. An error analysis of present perfect tense case study of freshman students at Nakhon Si Thammarat Rajabhat University : academic year 2008. , Thammasat University;
Yuttasak Arakkitsakul. (2008) An error analysis of present perfect tense case study of freshman students at Nakhon Si Thammarat Rajabhat University : academic year 2008 . Thammasat University/Bangkok.
Yuttasak Arakkitsakul. An error analysis of present perfect tense case study of freshman students at Nakhon Si Thammarat Rajabhat University : academic year 2008. . Bangkok:Thammasat University, 2008.
Yuttasak Arakkitsakul. (2008) An error analysis of present perfect tense case study of freshman students at Nakhon Si Thammarat Rajabhat University : academic year 2008 . Thammasat University/Bangkok.