Sources: Encyclopedia of Earth, International Hydrographic Organization, Regional Oceanography: an Introduction (Tomczak, 2005), Encyclopædia Britannica, and the International Telecommunication Union.
Fontes: Encyclopedia of Earth, Organización Hidrográfica Internacional, Regional Oceanography: an Introduction (Tomczak, 2005), Encyclopædia Britannica, e a Unión Internacional de Telecomunicacións.