Cite

[Section of a portolan chart spanning Great Britain in the west to the Adriatic Sea in the east.]

MLA

[Section of a Portolan Chart Spanning Great Britain in the West to the Adriatic Sea in the East.]. 0AD. https://collections.library.yale.edu/catalog/15826649.

APA, 6th edition

[Section of a portolan chart spanning Great Britain in the west to the Adriatic Sea in the east.]. (0 C.E.). [Manuscript maps, Portolan charts]. https://collections.library.yale.edu/catalog/15826649.