Everard, K. E., & Burrow, J. (1990). Business principles & management (Ninth edition.). South Western Publishing Co.
Lua i Stíl Chicago (17ú heag.)Everard, Kenneth E., agus Jim Burrow. Business Principles & Management. Ninth edition. Cincinnati, Ohio: South Western Publishing Co, 1990.
Lua MLA (9ú heag.)Everard, Kenneth E., agus Jim Burrow. Business Principles & Management. Ninth edition. South Western Publishing Co, 1990.
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