Duckworth, Angela Lee; Quinn, Patrick D. (2009-02-17). "Development and Validation of the Short Grit Scale (Grit–S)". Journal of Personality Assessment. 91 (2): 166–174. doi:10.1080/00223890802634290. ISSN0022-3891. PMID19205937.
Credé, M.; Tynan, M.C.; Harms, P.D. (September 2017). "Much ado about grit: A meta-analytic synthesis of the grit literature". Journal of Personality and Social Psychology. 113 (3): 492–511. doi:10.1037/pspp0000102. PMID27845531.
Duckworth, Angela Lee; Quinn, Patrick D. (2009-02-17). "Development and Validation of the Short Grit Scale (Grit–S)". Journal of Personality Assessment. 91 (2): 166–174. doi:10.1080/00223890802634290. ISSN0022-3891. PMID19205937.
Credé, M.; Tynan, M.C.; Harms, P.D. (September 2017). "Much ado about grit: A meta-analytic synthesis of the grit literature". Journal of Personality and Social Psychology. 113 (3): 492–511. doi:10.1037/pspp0000102. PMID27845531.
Duckworth, Angela Lee; Quinn, Patrick D. (2009-02-17). "Development and Validation of the Short Grit Scale (Grit–S)". Journal of Personality Assessment. 91 (2): 166–174. doi:10.1080/00223890802634290. ISSN0022-3891. PMID19205937.