MLA

Map of the Arctic Regions. Circumpolar Map No. II (Geographical Discoveries Made since 1818 in Red). Published as the Act directs, by John Murray, 1818. https://collections.library.yale.edu/catalog/15159334.

APA, 6th edition

Map of the Arctic Regions. Circumpolar Map no. II (Geographical Discoveries made since 1818 in Red). (1818). [Maps]. Published as the Act directs, by John Murray, https://collections.library.yale.edu/catalog/15159334.