Collins, B. J. (1951). Development plans explained. London: His Majesty's Stationery Office.
Παραπομπή Chicago StyleCollins, B. J. Development Plans Explained. London: His Majesty's Stationery Office, 1951.
Παραπομπή MLACollins, B. J. Development Plans Explained. London: His Majesty's Stationery Office, 1951.
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