Polyong C. P, Sarapimpha N, Deekla C, Phukkarawek S, Thepthong B, Poldongnok P, “Effects of Upper Musculoskeletal Disorder from School Bag Usage among Primary School Grade 4-6 Students for a School in Bangkok Metropolis”, J DMS, vol. 44, no. 4, pp. 48–53, Jul. 2019.