Spain & Portugal reduced from Jasr. Nantiat's map ...
MLA
Spain & Portugal Reduced from Jasr. Nantiat's Map ... W. Faden, 1812. https://collections.library.yale.edu/catalog/15487251.
APA, 6th edition
Spain & Portugal reduced from Jasr. Nantiat's map ... (1812). [Maps]. W. Faden, https://collections.library.yale.edu/catalog/15487251.