MLA

Sayer, Robert, 1725-1794. [A new map of the whole continent of America : divided into North and South and West Indies ...]. BRBL_00367. between 1783 and 1794?]. https://collections.library.yale.edu/catalog/15534702.

APA, 6th edition

Sayer, Robert, 1725-1794. (["BRBL_00367"])(between 1783 and 1794?])[[A new map of the whole continent of America : divided into North and South and West Indies ...]]. https://collections.library.yale.edu/catalog/15534702.