MLA

Jefferys, Thomas, -1771, cartographer. A new map of the King of Great Britain's dominions in Germany or the Electorate of Brunswick-Luneburg and its dependencies. June 1st, 1789.. https://collections.library.yale.edu/catalog/2046616.

APA, 6th edition

Jefferys, Thomas, -1771, cartographer. (June 1st, 1789.)[A new map of the King of Great Britain's dominions in Germany or the Electorate of Brunswick-Luneburg and its dependencies]. https://collections.library.yale.edu/catalog/2046616.