Rosario, Martin G., Jenniffer M. Vázquez, Wanda I. Cruz, and Alexis Ortiz. 2008. “Internal Consistency of the CHAMPS Physical Activity Questionnaire for Spanish Speaking Older Adults”. Puerto Rico Health Sciences Journal 27 (3). https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/73.