J. Durandt, J. Evans, P. Revington, A. Temple-Jones, and R. Lamberts, “Physical profiles of elite male field hockey and soccer players - application to sport-specific tests”, SA J Sports Med, vol. 19, no. 3, pp. 74–78, Oct. 2007, doi: 10.17159/2078-516X/2007/v19i3a257.