Map of Asia and adjoining Europe with a portion of Africa / prepared especially for the National Geographic Magazine, Gilbert Grosvenor, editor.
MLA
National Geographic Society (U.S.). Map of Asia and adjoining Europe with a portion of Africa / prepared especially for the National Geographic Magazine, Gilbert Grosvenor, editor.. BRBL_00273. c1921.. https://collections.library.yale.edu/catalog/15827171.
APA, 6th edition
National Geographic Society (U.S.). (["BRBL_00273"])(c1921.)[Map of Asia and adjoining Europe with a portion of Africa / prepared especially for the National Geographic Magazine, Gilbert Grosvenor, editor.]. https://collections.library.yale.edu/catalog/15827171.