Songra, Goldie; Clover, Matthew; Atack, Nikki E.; Ewings, Paul; Sherriff, Martyn; Sandy, Jonathan R.; Ireland, Anthony J. (2014). "Comparative assessment of alignment efficiency and space closure of active and passive self-ligating vs conventional appliances in adolescents: A single-center randomized controlled trial". American Journal of Orthodontics and Dentofacial Orthopedics. 145 (5): 569–78. doi:10.1016/j.ajodo.2013.12.024. PMID24785921.
Chen, Stephanie Shih-Hsuan; Greenlee, Geoffrey Michael; Kim, Jihyun-Elizabeth; Smith, Craig L.; Huang, Greg J. (2010). "Systematic review of self-ligating brackets". American Journal of Orthodontics and Dentofacial Orthopedics. 137 (6): 726.e1–726.e18, discussion 726–7. doi:10.1016/j.ajodo.2009.11.009. PMID20685517.
Songra, Goldie; Clover, Matthew; Atack, Nikki E.; Ewings, Paul; Sherriff, Martyn; Sandy, Jonathan R.; Ireland, Anthony J. (2014). "Comparative assessment of alignment efficiency and space closure of active and passive self-ligating vs conventional appliances in adolescents: A single-center randomized controlled trial". American Journal of Orthodontics and Dentofacial Orthopedics. 145 (5): 569–78. doi:10.1016/j.ajodo.2013.12.024. PMID24785921.
Chen, Stephanie Shih-Hsuan; Greenlee, Geoffrey Michael; Kim, Jihyun-Elizabeth; Smith, Craig L.; Huang, Greg J. (2010). "Systematic review of self-ligating brackets". American Journal of Orthodontics and Dentofacial Orthopedics. 137 (6): 726.e1–726.e18, discussion 726–7. doi:10.1016/j.ajodo.2009.11.009. PMID20685517.