Gilbert, P. T. (1921). The key to culture: Customs, manners and niceties of society. Geographical Pub.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGilbert, Paul Thomas. The Key to Culture: Customs, Manners and Niceties of Society. Chicago: Geographical Pub, 1921.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGilbert, Paul Thomas. The Key to Culture: Customs, Manners and Niceties of Society. Geographical Pub, 1921.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.