1. Bentler, P. M. (1990). Comparative fit indices in structural models. Psychological Bulletin, 107(2), 238–246. https://doi.org/10.1037/0033-2909.107.2.238.
2. Brislin, R. W. (1970). Back-translation for cross-cultural research. Journal of Cross-Cultural Psychology, 1(3), 185–216. https://doi.org/10.1177/135910457000100301.
3. Brown, T. (2015). Confirmatory factor analysis for applied research (2nd ed.). New York, NY: Guilford Press.
4. Bryant, F. B., & Yarnold, P. R. (1995). Principal-component analysis and exploratory and confirmatory factor analysis. In L. G. Grimm & P. R. Yarnold (Eds.), Reading and understanding multivariate statistics (pp. 99–136). Washington, DC: American Psychological Association.
5. Central Intelligence Agency. (2019). El Salvador – World Factbook. Retrieved from https://www.cia.gov/library/publications/the-world-factbook/attachments/summaries /ES-summary.pdf.