MLA

Nations, United. Frontier Area between Ethiopia and Trust Territory of Somaliland (under Italian Administration) / United Nations. United Nations, 1955. https://collections.library.yale.edu/catalog/15532728.

APA, 6th edition

Nations, U. (1955). Frontier area between Ethiopia and Trust Territory of Somaliland (under Italian administration) / United Nations. [Maps]. United Nations, https://collections.library.yale.edu/catalog/15532728.