Open University & Penney, K. (1974). Production and supply. Open U.P..
Chicago Style (17. basım) AtıfOpen University ve Ken Penney. Production and Supply. Milton Keynes: Open U.P., 1974.
MLA (8th ed.) AtıfOpen University ve Ken Penney. Production and Supply. Open U.P., 1974.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..