1. ConteS., DunsmjoreH. & ShenV. (1986). Software engineering metrics and models. Effect of team size on productivity (pp. 258–267). Don Mills: The Bejamin/Cumming.
2. Obdel-Hamid (1993). Software management—The dynamics of software project staffing: A system dynamics based simulation approach (4th ed., pp. 290–300). Washington, DC: IEEE.