Bergey, J., & Cohen, S. (2006). Product Line Acquisition in a DoD Organization -- Guidance for Decision Makers.
Chadwick, S. H. (2007). Defense Acquisition: Overview, Issues, and Options for Congress.
Dillard, J. T. (2005). Toward Centralized Control of Defense Acquisition Programs.
GAO. (2013). DEFENSE ACQUISITIONS: Assessments of Selected Weapon Programs (No. GAO-13-294SP). Retrieved from http://www.gao.gov/products/GAO-13-294SP.
GAO. (2014). DEFENSE ACQUISITIONS: Assessments of Selected Weapon Programs (No. GAO-14-340SP). Retrieved from http://www.gao.gov/products/GAO-14-340SP.
Kwak, Y. H., & Smith, B. M. (2009). Managing risks in mega defense acquisition projects: Performance, policy, and opportunities. International Journal of Project Management, 27(8), 812–820. http://doi.org/10.1016/j.ijproman.2009.02.002
Sauser, B. J., Ramirez-Marquez, J. E., Magnaye, R. B., & Tan, W. (2008). System Maturity Indices for Decision Support in the Defense Acquisition Process.
Schwartz, M. (2010). Defense Acquisitions: How DOD Acquires Weapon Systems and Recent Efforts to Reform the Process.
Worger, D., Jalao, E. R., Wirthlin, J. R., Colombi, J., & Wu, T. (2014). Intervention strategies for the Department of Defense acquisition process. The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology, 1548512914548615. http://doi.org/10.1177/1548512914548615
World Congress on Engineering and Computer Science, Ao, S. I., & International Association of Engineers (Eds.). (2009). A Comprehensive Review and Analysis of Maturity Assessment Approaches for Improved Decision Support to Achieve Efficient Defense Acquisition (Vol. World Congress on Engineering and Computer Science: WCECS 2009 : 20–22 October, 2009, San Francisco, USA). Hong Kong: Newswood Ltd., International Association of Engineers.
There are a number of resources out there depending on the nature of your specific question (including a recent interim update to the Department of Defense Instruction 5000.02 that gives an overview of the entire DoD acquisition process). Also, the Defense Acquisition University (DAU) website contains a wealth of information. Feel free to reach out to me via email if you need more specific information.