Gaya APA

Warfel, M., Waskey, F, H. (1979). The Professional food buyer : standards, principles, and procedures . California: McCutchan Publishing Co..

Gaya MLA

Warfel, M.C.., Waskey, Frank, H.. "The Professional food buyer : standards, principles, and procedures". California: McCutchan Publishing Co., 1979. BUKU.