1. Ambler, S.: The Object Primer: Agile Model-Driven Development with UML 2.0 (2004, 22 March)
2. Appleton, B. ACME Blog: Traceability and TRUST-ability.
http://bradapp.blogspot.com/2005/03/traceability-and-trust-ability.html
(2005, Tuesday, 15 March). Accessed June 2011
3. Appleton, B., Cowham, R., Berczuk, S.: Lean traceability: A smattering of strategies and solutions, CM Crossroads (Configuration Management) (2007, Tuesday, 18 September, 16:57)
4. Beck, K., Andres, C.: Extreme programming explained:embrace change, 2nd edn. Addison-Wesley, Boston, MA (2004). ISBN:0321278658
5. Cleland-Huang, J.: Just enough requirements traceability. COMPSAC 1, 41–42 (2006)