MLA

Delarochette, L. (Louis), 1731-1802. A chart of the islands of Jersey and Guernsey, Sark, Herm and Alderney, with the adjacent coast of France. Jany. 1st, 1781.. https://collections.library.yale.edu/catalog/2046606.

APA, 6th edition

Delarochette, L. (Louis), 1731-1802. (Jany. 1st, 1781.)[A chart of the islands of Jersey and Guernsey, Sark, Herm and Alderney, with the adjacent coast of France]. https://collections.library.yale.edu/catalog/2046606.