APA (7th ed.) Citation

Leenders, M. R., Fearon, H. E., & England, W. B. (1989). Purchasing and materials management (9. ed.). Irwin.

Chicago Style (17th ed.) Citation

Leenders, Michiel R., Harold E. Fearon, and Wilbur B. England. Purchasing and Materials Management. 9. ed. Homewood, Ill. u.a: Irwin, 1989.

MLA (9th ed.) Citation

Leenders, Michiel R., et al. Purchasing and Materials Management. 9. ed. Irwin, 1989.