Draper, J. (2004). Isan: the planning context for language maintenance and revitalization. Second Language Learning & Teaching, IV. Truy cập usq.edu.auLưu trữ 2008-03-06 tại Wayback Machine
Draper, J. (2004). Isan: the planning context for language maintenance and revitalization. Second Language Learning & Teaching, IV. Truy cập usq.edu.auLưu trữ 2008-03-06 tại Wayback Machine