J. Pillay, T. Kolbe-Alexander, M. Achmat, M. Carstene, and E. Lambert, “Are point-of-decision prompts in a sports science and medicine centre effective in changing the prevalence of stair usage? A preliminary study”, SA J Sports Med, vol. 21, no. 2, Jul. 2009, doi: 10.17159/2078-516X/2009/v21i2a299.