MLA

An Accurate Chart of the Bay of Biscay ... Taken in 1756 & 1757 ... By Mr. Magin Engineer to the Marine. Laurie & Whittle, 1794. https://collections.library.yale.edu/catalog/15484150.

APA, 6th edition

An accurate chart of the Bay of Biscay ... taken in 1756 & 1757 ... By Mr. Magin Engineer to the Marine. (1794). [Nautical charts]. Laurie & Whittle, https://collections.library.yale.edu/catalog/15484150.