* [Thu97] William P. Thurston.  Three-dimensional geometry and topology. Vol. 1, volume 35 of Princeton Mathematical Series.  Princeton University Press, Princeton, NJ, 1997.  Edited by Silvio Levy.
  * [Wol10] Scott A. Wolpert.  Families of Riemann surfaces and Weil-Petersson geometry, volume 113 of CBMS Regional Conference Series in Mathematics.  Published for the Conference Board of the Mathematical Sciences, Washington, DC; by the American Mathematical Society, Providence, RI, 2010.