1. American Occupational Therapy Association, Retrieved from: http://www.aota.org on 27 2016.
2. American Physical Therapy Association, Retrieved from: http://www.apta.org on 27 2016.
3. American Academy of Pediatrics, Retrieved from: http://www.aao.org on 25 June 2016.
4. Study of school bag weight and back pain among primary school children in Al-Ahsa, Saudi Arabia;Al-Saleem;Epidemiology,2016
5. Schoolbag carriage and schoolbag-related musculoskeletal discomfort among primary school children;Dockrell;Appl. Ergon.,2015