The document class "thesis" uses the LATEX document class book for formatting a PhD thesis in LATEX.
A short description is available as PDF file, the complete set is in a ZIP file.
Current version 2.1 from 13 August 2010.
Alternatively, you can download the Version 2.2 ZIP file (without PDF description).
This experimental version provided by Shahin Jafarzadeh is from July 2013.