M. Adamu and M. M. Abdu Shakur, “The Relationships of Expectancy, Instrumentality and Valence for Motivation in Self-Employment: A Mediation of Entrepreneurial Motivation in Nigeria”, ijbmf, vol. 2, no. 1, pp. 48–54, Apr. 2018, doi: 10.46281/ijbmf.v2i1.119.