Παραπομπή APA

Kay, F. (1960). Purchasing for Industry and public undertaking. Sir Isaac pitman.

Παραπομπή Chicago Style

Kay, F. Purchasing for Industry and Public Undertaking. London: Sir Isaac pitman, 1960.

Παραπομπή MLA

Kay, F. Purchasing for Industry and Public Undertaking. Sir Isaac pitman, 1960.