ตาใจ ธ., ณ ตะกั่วทุ่ง อ. and หัตถสิน ย. 2016. Development of the Pinpoint Material on Barcode Symbols with a Barcode Readable System for Northern School for the Blind under the Patronage of the Queen, Chiang Mai. RMUTL Engineering Journal. 1, 2 (Dec. 2016), 14–21. DOI:https://doi.org/10.14456/rmutlengj.2016.13.