1. Abraham, K. G. (1986). Ego-identity differences among Anglo-American and Mexican-American adolescents. J. Adolesc. 9: 151–166.
2. Ackermann, C. J. (1990). Identiteitsontwikkeling tydens adolessensie:' n groep sekondêre skool-leerlinge se evaluering van die belangrikheid van lewensterreine [Identity development in adolescence: Evaluation of the importance of life domains by a group of secondary school learners]. S. Afr. J. Educ. 10(4): 283–290.
3. Ackermann, C. J. (1995). Identiteitsontwikkeling by Afrikaanssprekende adolessente in die domeine van beroep en godsdiens [Identity formation among Afrikaans-speaking adolescents in the domains of occupation and religion]. S. Afr. J. Educ. 15(3): 138–143.
4. Ackermann, C. J. (1997). Identity development among English-speaking adolescents in the occupational and religious domains. S. Afr. J. Educ. 17(2): 84–88.
5. Alberts, C. (1990, June). Identity formation of Black university students: An empirical investigation. Paper presented at the 8th National Congress of the Psychological Association of South Africa, Stellenbosch, Republic of South Africa.