1. Cheng JCY, Chan KM, Ma GFY, Leung PC (1984) Polydactyly of the thumb: a surgical plan based on ninety-five cases. J Hand Surg [Am] 9:155–164
2. Cohen MS (1998) Thumb duplication. Hand Clin 14(1):17–27
3. Dobyns JH, Lipscomb PR, Cooney WP (1985) Management of thumb duplication. Clin Orthop 195:26–44
4. Dobyns JH, Wood VE, Bayne LG (1993) Congenital hand deformities. In: Green DP (ed) Operative hand surgery. Churchill and Livingstone, New York, pp 251–549
5. Flatt A (1994) The care of congenital hand anomalies. Quality Medical Publishing, St. Louis