du Plessis, G. A., C. F. Saccaggi, and G. P. de Bruin. “Cross-Cultural Differences in the Character Strength of Citizenship in South Africa”. PINS-Psychology in Society, Vol. 48, no. 1, Apr. 2015, pp. 22-44, doi:10.17159//2309-8708/2015/n48a2.