United States National Imagery and Mapping Agency (NIMA/NGA, USA); Center for Ancient Middle Eastern Landscapes, Institute for the Study of Ancient Cultures, University of Chicago
United States National Imagery and Mapping Agency (2016). Operational Navigation Chart: ONC_G-1_Strait_of_Gibraltar_4th_Edition. United States National Imagery and Mapping Agency. https://isac-idb.uchicago.edu/id/cf917d47-b6b3-4128-822d-78fd71369fa9 (map)