Rushton, P.W., Miller, W.C., Kirby, R.L. and Eng, J.J. 2012. Measure for the assessment of confidence with manual wheelchair use (WheelCon-M) version 2.1: reliability and validity. Journal of Rehabilitation Medicine. 45, 1 (Oct. 2012), 61–67. DOI:https://doi.org/10.2340/16501977-1069.