Great Britain. Colonial Office. (1950). Further correspondence from the Secretary of State on the plan of economic development for Sierra Leone. [The Government Printer].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Great Britain. Colonial Office. Further Correspondence from the Secretary of State on the Plan of Economic Development for Sierra Leone. [Freetown]: [The Government Printer], 1950.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Great Britain. Colonial Office. Further Correspondence from the Secretary of State on the Plan of Economic Development for Sierra Leone. [The Government Printer], 1950.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.