This list is constantly updated and expanded. Its intention is not to be exhaustive, but only to help locating general references.

1. Iterated Maps on the Interval as Dynamical Systems, Pierre Collet and Jean-Pierre Eckman.
   Progress in Physics, Birkhauser, 1980.
   
   
2. One-Dimensional Dynamics, Welington de Melo and Sebastian Van Strien.
   Springer Verlag, 1993.
   
   
3. Sur les Courbes Invariantes par les Diphéomorphismes de l'anneau, Michael R. Herman.
   Société Mathématique de France. Asterisque vol. 1 nos. 103-104, 1983 and vol. 2 no. 144, 1986.