Leenders, M. R., & Fearon, H. E. (1993). Purchasing and materials management (10th ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Leenders, Michiel R., agus Harold E. Fearon. Purchasing and Materials Management. 10th ed. Homewood, IL: Irwin, 1993.
Lua MLA (9ú heag.)Leenders, Michiel R., agus Harold E. Fearon. Purchasing and Materials Management. 10th ed. Irwin, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.