(1969). Annual abstract of statistics /: No. 106 : 1969. London: Her Majesty's Stationery Office.
Παραπομπή Chicago StyleAnnual Abstract of Statistics /: No. 106 : 1969. London: Her Majesty's Stationery Office, 1969.
Παραπομπή MLAAnnual Abstract of Statistics /: No. 106 : 1969. London: Her Majesty's Stationery Office, 1969.
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