Douglas, E. J. (1987). Managerial economics: Analysis and strategy (3rd ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Douglas, Evan J. Managerial Economics: Analysis and Strategy. 3rd ed. Englewood Cliffs, N.J.: Prentice-Hall, 1987.
Lua MLA (9ú heag.)Douglas, Evan J. Managerial Economics: Analysis and Strategy. 3rd ed. Prentice-Hall, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.