Sanpawat Kantabutra. 2014. The complexities of some graph labelings. Chiang Mai:Chiang Mai University;
Sanpawat Kantabutra. (2014) The complexities of some graph labelings (รายงานผลงานวิจัย). Chiang Mai University:Chiang Mai.
Sanpawat Kantabutra. The complexities of some graph labelings. Chiang Mai:Chiang Mai University, 2014.
Sanpawat Kantabutra. (2014) The complexities of some graph labelings (รายงานผลงานวิจัย). Chiang Mai University:Chiang Mai.