Cite

Africa - Continent: Political map, distribution of human energy

MLA

Huntington, Ellsworth, 1876-1947. Africa - Continent: Political map, distribution of human energy. Box 2, folder 39. undated. https://collections.library.yale.edu/catalog/32506342.

APA, 6th edition

Huntington, Ellsworth, 1876-1947. (["Box 2, folder 39"])(undated)[Africa - Continent: Political map, distribution of human energy]. https://collections.library.yale.edu/catalog/32506342.