APA (7e ed.) Bronvermelding

Gilbert, P. T. (1921). The key to culture: Customs, manners and niceties of society. Geographical Pub.

Chicago (17e ed.) Bronvermelding

Gilbert, Paul Thomas. The Key to Culture: Customs, Manners and Niceties of Society. Chicago: Geographical Pub, 1921.

MLA (9e ed.) Bronvermelding

Gilbert, Paul Thomas. The Key to Culture: Customs, Manners and Niceties of Society. Geographical Pub, 1921.