Cite

A chart of the Atlantic Ocean : I. sheet.

MLA

Sayer, Robert, 1725-1794. A chart of the Atlantic Ocean : I. sheet.. 20 Feby. 1782.. https://collections.library.yale.edu/catalog/16729371.

APA, 6th edition

Sayer, Robert, 1725-1794. (20 Feby. 1782.)[A chart of the Atlantic Ocean : I. sheet.]. https://collections.library.yale.edu/catalog/16729371.