1. Altova Umodel. (2006). Altova. http://www.altova.com . Used 2008, 2009.
2. eXist Database. (2008). http://exist-db.org . Accessed 2008.
3. JDepends Open Source Software. (2008; 2009). http://www.clarkware.com/software/JDepend.html . Used 2008, 2009.
4. JRefactory Open Source Software. (2008). http://jrefactory.sourceforge.net . Accessed 2008.
5. PatternSeeker Tool. (2008). Colorado State University. Accessed 2008.