Gramlich, E. M. (1990). A guide to benefit-cost analysis (2nd ed.). Prentice-Hall.
Cita Chicago (17th ed.)Gramlich, Edward M. A Guide to Benefit-cost Analysis. 2nd ed. Englewood Cliffs, N.J: Prentice-Hall, 1990.
Cita MLA (9th ed.)Gramlich, Edward M. A Guide to Benefit-cost Analysis. 2nd ed. Prentice-Hall, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.