1. American Cleft Palate-Craniofacial Association. Parameters for the evaluation and treatment of patients with cleft lip/palate or other craniofacial anomalies. Summary of recommendations, 2000. Retrieved from www.acpa-cpf.org/ teamcare/.
2. American Speech-Language-Hearing Association: Evidence-based practice: practice guidelines. Retrieved from http//:professional.asha.org/communityslp/evidence_guidelines.cfm.
3. Bardach J, Morris JH, Olin WH. Late results of primary veloplasty: the Marburg project. Plast Reconstr Surg 1984; 73:207–215.
4. Berkowitz S (2002) Timing of cleft palate closure should be based on the ratio of the area of the cleft to that of the palatal segments and not on age alone. Presented before the American Cleft Palate-Craniofacial Association, Asheville NC, April 30.
5. Blijdorp P, Muller H. The influence of the age at which the palate is closed on speech in the adult cleft palate patient. J Maxillofac Surg 1984; 12:239–246.