Tim Urban, «The Thinking Ladder», Wait but Why (blog), September 27, 2019, .

Dov Eden, «Means Efficacy: External Sources of General and Specific Subjective Efficacy», in Work otivation in the Context of a Globalizing Economy, ed. Miriam Erez, Uwe Kleinbeck, and Henk Thierry (Mahwah, NJ: Erlbaum, 2001); Dov Eden et al., «Augmenting Means Efficacy to Boost Performance: Two Field Experiments», Journal of Management 36 (2008): 687–713.