Rubin, D. A., M. Mouttapa, J. W. Weiss, and A. Barrera-Ng. “Physical Activity in Children With Prader-Willi Syndrome: A Parents’ Perspective”. Californian Journal of Health Promotion, Vol. 10, no. SI-Obesity, Aug. 2012, pp. 57-66, doi:10.32398/cjhp.v10iSI-Obesity.1471.