References:
Kashdan, T. B., Disabato, D. J., Goodman, F. R., Doorley, J. D., & McKnight, P. E. (2020). Understanding psychological flexibility: A multimethod exploration of pursuing valued goals despite the presence of distress. Psychological Assessment, 32(9), 829–850. DOI: 10.1037/pas0000834
Akbari, M., Disabato, D., Seydavi, M. & Zamani, E. (2021). The Persian Personalized Psychological Flexibility Index (P-PPFI): Psychometric properties in a general population sample of Iranians. Journal of Contextual Behavioral Science, 22, 32-43. DOI: 10.1016/j.jcbs.2021.09.004
Cherry, K.M., Vander Hoeven, E., Patterson, T.S., & Lumley, M.N. (2021). Defining and measuring “psychological flexibility”: A narrative scoping review of diverse flexibility and rigidity constructs and perspectives. Clinical Psychology Review, 84, 101973. DOI: 10.1016/j.cpr.2021.101973
The PPFI English version and in Persian version in this Journal of Contextual Behavioral Science article Appendix A.