1. Jenny, J. (1975). A social perspective on need and demand for orthodontic treatment. International Dental Journal, 25(4), 248–256.
2. Mohlin, B., al-Saadi, E., Andrup, L., & Ekblom, K. (2002). Orthodontics in 12-year old children. Demand, treatment motivating factors and treatment decisions. Swedish Dental Journal, 26(2), 89–98.
3. Kiyak, H. A. (2008). Does orthodontic treatment affect patients’ quality of life? Journal of Dental Education, 72(8), 886–894.
4. Bernabé, E., & Flores-Mir, C. (2006). Normative and self-perceived orthodontic treatment need of a Peruvian university population. Head & Face Medicine, 3(2), 2–22.
5. Bernabé, E., Kresevic, V. D., Cabrejos, S. C., Flores-Mir, F., & Flores-Mir, C. (2006). Dental esthetic self-perception in young adults with and without previous orthodontic treatment. The Angle Orthodontist, 76(3), 412–416.