Não informado. (2018). Overseas Trade Statistics of the United Kingdom. Her Majesty's Stationery Office.
Lua i Stíl Chicago (17ú heag.)Não informado. Overseas Trade Statistics of the United Kingdom. London: Her Majesty's Stationery Office, 2018.
Lua MLA (8ú heag.)Não informado. Overseas Trade Statistics of the United Kingdom. Her Majesty's Stationery Office, 2018.
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