Deci, Edward L., and Richard M. Ryan. “The General Causality Orientations Scale: Self-Determination in Personality”. Journal of Research in Personality, vol. 19, no. 2, 1985, pp. 109-34, https://doi.org/10.1016/0092-6566(85)90023-6.
Deci, E. L., & Ryan, R. M. (1985). The general causality orientations scale: Self-determination in personality. Journal of Research in Personality, 19(2), 109-134. https://doi.org/10.1016/0092-6566(85)90023-6
Deci EL, Ryan RM. The general causality orientations scale: Self-determination in personality. Journal of Research in Personality. 1985;19(2):109-34.