Gilbert, P. T. (1921). The key to culture: Customs, manners and niceties of society. Geographical Pub.
Lua i Stíl Chicago (17ú heag.)Gilbert, Paul Thomas. The Key to Culture: Customs, Manners and Niceties of Society. Chicago: Geographical Pub, 1921.
Lua MLA (9ú heag.)Gilbert, Paul Thomas. The Key to Culture: Customs, Manners and Niceties of Society. Geographical Pub, 1921.
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