People Capability Maturity Model (P-CMM)
Curits, B., W.E. Hefley, and S.A. Miller. 2001. People Capability Maturity Model (P-CMM), Version 2.0. Pittsburg, PA, USA: Software Engineering Institute (SEI). CMU/SEI-2001-MM-01. Accessed on June 8, 2012. Available at http://www.sei.cmu.edu/library/abstracts/reports/01mm001.cfm
This source is considered a primary reference for the Team Capability article.
To read an overview of this source, see the SEI website.