Gaya APA
Dobler, D, W. et al (1990).
Purchasing and materials management : text and cases (5th.ed.).
Singapore:
McGraw-Hill Book Co..
Gaya MLA
Dobler, Donlad, W.. et al.
"Purchasing and materials management : text and cases".
5th.ed.
Singapore:
McGraw-Hill Book Co.,
1990.
Text.