Gaya APA
Heinritz, S, F., Farrell, P, V. (1971).
Purchasing : principles and applications. (1971).
:
Englewood Cliffs : Prentuce-Hall, Inc.,.
Gaya MLA
Heinritz, Stuart, F.., Farrell, Paul, V..
"Purchasing : principles and applications.".
1971
:
Englewood Cliffs : Prentuce-Hall, Inc.,,
1971.
Text.