Não informado. (1956). Ports and Harbors. International Association of Ports and Harbors.
Chicago-referens (17:e uppl.)Não informado. Ports and Harbors. Tokyo: International Association of Ports and Harbors, 1956.
MLA-referens (8:e uppl.)Não informado. Ports and Harbors. International Association of Ports and Harbors, 1956.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.