APA (7. basım) Alıntı

National Institute of Governmental Purchasing (U.S.). (1993). Government procurement. Penton Pub..

Chicago Style (17. basım) Atıf

National Institute of Governmental Purchasing (U.S.). Government Procurement. Cleveland, Ohio: Penton Pub., 1993.

MLA (8th ed.) Atıf

National Institute of Governmental Purchasing (U.S.). Government Procurement. Penton Pub., 1993.