Gill, G. K.; Kemerer, C. F. (December 1991). "Cyclomatic complexity density and software maintenance productivity". IEEE Transactions on Software Engineering. 17 (12): 1284–1288. doi:10.1109/32.106988. ISSN1939-3520.
Fenton, Norman E. (2014). Software metrics : a rigorous and practical approach. James Bieman (3rd ed.). Boca Raton, FL. ISBN978-1-4398-3823-5. OCLC834978252.{{cite book}}: CS1 maint: location missing publisher (link)
Gill, G. K.; Kemerer, C. F. (December 1991). "Cyclomatic complexity density and software maintenance productivity". IEEE Transactions on Software Engineering. 17 (12): 1284–1288. doi:10.1109/32.106988. ISSN1939-3520.