Perapong Suaykratok และ Aree Manosuthikit. (2018) Inclusion of the minority language on public signs: multilingualism in the deep South of Thailand. National Institute of Development Administration:ม.ป.ท.Perapong Suaykratok และ Aree Manosuthikit. 2018. Inclusion of the minority language on public signs: multilingualism in the deep South of Thailand. ม.ป.ท.:National Institute of Development Administration;Perapong Suaykratok และ Aree Manosuthikit. Inclusion of the minority language on public signs: multilingualism in the deep South of Thailand. ม.ป.ท.:National Institute of Development Administration, 2018. Print.