Douglas, E. J. (1987). Managerial economics: Analysis and strategy (3rd ed.). Prentice-Hall.
Cita Chicago (17th ed.)Douglas, Evan J. Managerial Economics: Analysis and Strategy. 3rd ed. Englewood Cliffs, N.J.: Prentice-Hall, 1987.
Cita MLA (9th ed.)Douglas, Evan J. Managerial Economics: Analysis and Strategy. 3rd ed. Prentice-Hall, 1987.