(2015). Food production generic competencies communicate in english on the telephone D1.LAN.CL10.04 Assessor Manual. กรุงเทพมหานคร: Office of the permanent secretary ministry of tourism and sports.
MLA CitationFood Production Generic Competencies Communicate in English On the Telephone D1.LAN.CL10.04 Assessor Manual. กรุงเทพมหานคร: Office of the permanent secretary ministry of tourism and sports, 2015.