Chart showing the track of the great submarine Atlantic telegraph : with the principal land & submarine telegraph lines in Europe & America, also the tracks of steamships, and the depth of the ocean.
MLA
Lloyd, H. H., and Co. Chart Showing the Track of the Great Submarine Atlantic Telegraph : with the Principal Land & Submarine Telegraph Lines in Europe & America, Also the Tracks of Steamships, and the Depth of the Ocean. H.H. Lloyd & Co., 0AD. https://collections.library.yale.edu/catalog/15235117.
APA, 6th edition
Lloyd, H. H., & C. (0 C.E.). Chart showing the track of the great submarine Atlantic telegraph : with the principal land & submarine telegraph lines in Europe & America, also the tracks of steamships, and the depth of the ocean. [Maps]. H.H. Lloyd & Co., https://collections.library.yale.edu/catalog/15235117.