Koontz, H. (1981). A practical introduction to business. Richard D. Irwin.
Chicago Style (17. basım) AtıfKoontz, Harold. A Practical Introduction to Business. Homewood, Ill.: Richard D. Irwin, 1981.
MLA (9th ed.) AtıfKoontz, Harold. A Practical Introduction to Business. Richard D. Irwin, 1981.
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