Upady Hatthasin และผู้แต่งคนอื่นๆ. (2017) Precision Assessment on a Voice-Able Device of Checking Cash for the Northern Region School for the Visually Impaired under the Royal Patronage of Her Majesty the Queen in Chiang Mai Province. <i>RMUTL Engineering Journal</i>, <i>2</i>(2), 63-72.Upady Hatthasin และผู้แต่งคนอื่นๆ. "Precision Assessment on a Voice-Able Device of Checking Cash for the Northern Region School for the Visually Impaired under the Royal Patronage of Her Majesty the Queen in Chiang Mai Province". RMUTL Engineering Journal 2 (2017):63-72.Upady Hatthasin และผู้แต่งคนอื่นๆ. Precision Assessment on a Voice-Able Device of Checking Cash for the Northern Region School for the Visually Impaired under the Royal Patronage of Her Majesty the Queen in Chiang Mai Province. Rajamangala University of Technology Lanna:ม.ป.ท. 2017.