Gaya APA

Institute, A, H, &, M, A, E., Virts, W, B. (1987). Purchasing for hospitality operations . Michigan: Educational Institute of AHMA.

Gaya MLA

Institute, American, Hotel, &, Motel, Association., Educational., Virts, William, B.. "Purchasing for hospitality operations". Michigan: Educational Institute of AHMA, 1987. BUKU.