Philippe, Julien (2007-04-01). "The origin of treatment expansion". American Journal of Orthodontics and Dentofacial Orthopedics. 131 (4): 446, author reply 446. doi:10.1016/j.ajodo.2007.02.044. ISSN1097-6752. PMID17418705.
Timms, D. J. (1997-05-01). "Emerson C. Angell (1822-1903). Founding father of rapid maxillary expansion". Dental Historian: Lindsay Club Newsletter (32): 3–12. ISSN0958-6687. PMID9879204.
Hirsch, G. P. (1977-06-01). "Palatal expansion - adjunct to dentofacial orthopedics". International Journal of Orthodontics. 15 (2): 23–29, 46. ISSN0020-7500. PMID328420.
Philippe, Julien (2007-04-01). "The origin of treatment expansion". American Journal of Orthodontics and Dentofacial Orthopedics. 131 (4): 446, author reply 446. doi:10.1016/j.ajodo.2007.02.044. ISSN1097-6752. PMID17418705.
Timms, D. J. (1997-05-01). "Emerson C. Angell (1822-1903). Founding father of rapid maxillary expansion". Dental Historian: Lindsay Club Newsletter (32): 3–12. ISSN0958-6687. PMID9879204.
Hirsch, G. P. (1977-06-01). "Palatal expansion - adjunct to dentofacial orthopedics". International Journal of Orthodontics. 15 (2): 23–29, 46. ISSN0020-7500. PMID328420.
Philippe, Julien (2007-04-01). "The origin of treatment expansion". American Journal of Orthodontics and Dentofacial Orthopedics. 131 (4): 446, author reply 446. doi:10.1016/j.ajodo.2007.02.044. ISSN1097-6752. PMID17418705.