Gaya APA

DOBLER, D, W., Lee, L. (1990). PURCHASING AND MATERIALS MANAGEMENT : TEXT AND CASES (Ed ke-5). Amerika: McGrawe-Hill.

Gaya MLA

DOBLER, Donald, W., Lee, Lamar. "PURCHASING AND MATERIALS MANAGEMENT : TEXT AND CASES". Ed ke-5 Amerika: McGrawe-Hill, 1990. Text.