Cita APA (7th ed.)
American Association of Cost Engineers & Humphreys, K. K. (1991). Jelen's cost and optimization engineering (3rd ed.). McGraw-Hill.
Cita Chicago (17th ed.)
American Association of Cost Engineers i Kenneth King Humphreys. Jelen's Cost and Optimization Engineering. 3rd ed. New York: McGraw-Hill, 1991.
Cita MLA (9th ed.)
American Association of Cost Engineers i Kenneth King Humphreys. Jelen's Cost and Optimization Engineering. 3rd ed. McGraw-Hill, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.