MLA

Uppdráttr Íslands Eptir Björn Gunnlaugson. 1859. https://collections.library.yale.edu/catalog/15471472.

APA, 6th edition

Uppdráttr Íslands eptir Björn Gunnlaugson. (1859). [Maps]. https://collections.library.yale.edu/catalog/15471472.