AUTHOR=Gucciardi Daniel F. TITLE=Commentary: Mental Toughness and Individual Differences in Learning, Educational and Work Performance, Psychological Well-being, and Personality: A Systematic Review JOURNAL=Frontiers in Psychology VOLUME=8 YEAR=2018 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.02329 DOI=10.3389/fpsyg.2017.02329 ISSN=1664-1078