Gaya APA

Douglas, E, J. (1992). Managerial economics : analysis and strategy (4th ed). Englewood Cliffs, NJ: Prentice-Hall.

Gaya MLA

Douglas, Evan, J.. "Managerial economics : analysis and strategy". 4th ed Englewood Cliffs, NJ: Prentice-Hall, 1992. Text.