Não informado. (2018). Overseas Trade Statistics of the United Kingdom. Her Majesty's Stationery Office.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Overseas Trade Statistics of the United Kingdom. London: Her Majesty's Stationery Office, 2018.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Overseas Trade Statistics of the United Kingdom. Her Majesty's Stationery Office, 2018.
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