1. Gillies H, Millard DR Jr. The Principles and Art of Plastic Surgery. Vol. 1. Boston: Little Brown and Company; 1957. p. 49.
2. Salyer KE. Unilateral cleft lip and cleft lip nasal reconstruction. In: Bardach J, Morris HL, editors. Multidisciplinary Management of Cleft Lip and Palate. Philadelphia: WB Saunders Company; 1990. p. 179-80.
3. Millard DR Jr. Unilateral cleft lip deformity. In: McCarthy J, editor. Plastic Surgery. Vol. 4. Philadelphia: WB Saunders Company; 1990. p. 2639.