Marques, A.I., M.  Rosa, M.  Amorim, P.  Soares, A.  Oliveira-Tavares, Rui  Santiago, J.  Mota, and J. F.  Carvalho. ?Study Protocol: Using The Q-Steps To Assess And Improve The Quality Of Physical Activity Programmes For The Elderly?. Bmc Research Notes 5. Bmc Research Notes  (2012).

Marques, A.I., M.  Rosa, P.  Soares, Rui  Santiago, J.  Mota, and J. F.  Carvalho. ?Evaluation Of Physical Activity Programmes For Elderly People - A Descriptive Study Using The Efqm' Criteria?. Bmc Public Health 11. Bmc Public Health  (2011). doi:https://doi.org/10.1186/1471-2458-11-123.