1. ABES (Unknown Month 2007) The Brazilian Software Market [Online]. Brazilian Association of Software Companies, volumes from 2006 to 2012 . https://www.abessoftware.com.br/dados-do-setor/anos-anteriores
2. Boehm BW (1981) Software Engineering Economics. Prentice Hall
3. Boehm BW (1987) Improving software productivity. IEEE Comput 20(9):43–57
4. Brynjolfsson E, Hitt LM (1998) Beyond the productivity paradox. Commun ACM 41(8):49–55
5. Chrissis MB, Konrad M, Shrum S (2006) CMMI: Guidelines For process integration and product improvement. Addison-Wesley, SEI Series in Software Engineering