Koontz, H., & Fulmer, R. M. (1978). A practical introduction to business (Rev. ed.). R. D. Irwin.

Koontz, Harold, and Robert M. Fulmer. A Practical Introduction to Business. Rev. ed. Homewood, Ill.: R. D. Irwin, 1978.

Koontz, Harold, and Robert M. Fulmer. A Practical Introduction to Business. Rev. ed. R. D. Irwin, 1978.