Lazaridis Α., Digelidis Ν., and Krommydas Χ. “Construct Validity of the ‘Motives for Physical Activity Measure-Revised’ (MPAM-R) Questionnaire in a Sample of Greek Secondary School Pupils”. Inquiries in Physical Education and Sport, vol. 17, no. 1, Mar. 2019, pp. 1-14, doi:10.26253/heal.uth.ojs.ispe.2019.1520.