Dehghan Nayeri, N., A. H. Goudarzian, K. . Herth, N. Naghavi, H. Sharif Nia, A. Yaghoobzadeh, S. Pahlevan Sharif, and K.-A. . Allen. “Construct Validity of the Herth Hope Index: A Systematic Review”. International Journal of Health Sciences, vol. 14, no. 5, Aug. 2020, pp. 50-57, https://ijhs.qu.edu.sa/index.php/journal/article/view/4735.