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Sivaporn Keowsangk. 2001. A study of discrepancy levels in a wareness of the importance in English utilization between businesspersons and business students. Field of Study Communicative English, Ramkhamhaeng University;
Sivaporn Keowsangk. (2001) A study of discrepancy levels in a wareness of the importance in English utilization between businesspersons and business students . Ramkhamhaeng University/Bangkok.
Sivaporn Keowsangk. A study of discrepancy levels in a wareness of the importance in English utilization between businesspersons and business students. . Bangkok:Ramkhamhaeng University, 2001.
Sivaporn Keowsangk. (2001) A study of discrepancy levels in a wareness of the importance in English utilization between businesspersons and business students . Ramkhamhaeng University/Bangkok.