Penny, E. M. (1932). The co-operative movement and the consumer. York: National Guild of Co-operators (NGC).
Chicago Style (17. basım) AtıfPenny, Edna M. The Co-operative Movement and the Consumer. York: National Guild of Co-operators (NGC), 1932.
MLA (8th ed.) AtıfPenny, Edna M. The Co-operative Movement and the Consumer. York: National Guild of Co-operators (NGC), 1932.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..