Não informado. (1921). World tanker fleet review. John I. Jacobs and Company.
Lua i Stíl Chicago (17ú heag.)Não informado. World Tanker Fleet Review. London: John I. Jacobs and Company, 1921.
Lua MLA (8ú heag.)Não informado. World Tanker Fleet Review. John I. Jacobs and Company, 1921.
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