Stewart, R. D. (1990). Cost estimating (2nd ed.). Wiley.
Cita Chicago (17th ed.)Stewart, Rodney D. Cost Estimating. 2nd ed. New York: Wiley, 1990.
Cita MLA (9th ed.)Stewart, Rodney D. Cost Estimating. 2nd ed. Wiley, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.