Heinritz, S. (1986). Purchasing principle and applications (7th edition.). Prentice Hall.
Citazione stile Chigago Style (17a edizione)Heinritz, Stuart. Purchasing Principle and Applications. 7th edition. United states of America: Prentice Hall, 1986.
Citatione MLA (9a ed.)Heinritz, Stuart. Purchasing Principle and Applications. 7th edition. Prentice Hall, 1986.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.