1. Ahmadi, B., Amini Sanii, N., Bani, F., & Bakhtari, F. (2018). Predictors of physical activity in older adults in Northwest of Iran. Elderly Health Journal, 4(2), 75–80.
2. Allison, P. D. (2003). Missing data techniques for structural equation modeling. Journal of Abnormal Psychology, 112(4), 545–557.
3. Antunes, R., Couto, N., Monteiro, D., Moutão, J., Marinho, D., & Cid, L. (2018). Goal content for the practice of physical activity and the impact on subjective well-being in older adults. Journal of Aging Science, 6(1), 1–6.
4. Baltes, P. B. (1987). Theoretical propositions of life-span developmental psychology: On the dynamics between growth and decline. Developmental Psychology, 23(5), 611–625.
5. Baltes, P. B., Staudinger, U. M., & Lindenberger, U. (1999). Lifespan psychology: Theory and application to intellectual functioning. Annual Review of Psychology, 50(1), 471–507.