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