Suwannaporn Suphapruksapongse. (1998) A study of English language use at the Mining Business Unit, Electricity Generating Authority of Thailand. National Institute of Development Administration:ม.ป.ท.Suwannaporn Suphapruksapongse. 1998. A study of English language use at the Mining Business Unit, Electricity Generating Authority of Thailand. ม.ป.ท.:National Institute of Development Administration;Suwannaporn Suphapruksapongse. A study of English language use at the Mining Business Unit, Electricity Generating Authority of Thailand. ม.ป.ท.:National Institute of Development Administration, 1998. Print.