Charles River Associates & United States. General Services Administration. Propertty Management and Disposal Service. (1969). An economic analysis of the cobalt industry. CRA.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Charles River Associates و United States. General Services Administration. Propertty Management and Disposal Service. An Economic Analysis of the Cobalt Industry. Cambridge, Mass: CRA, 1969.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Charles River Associates و United States. General Services Administration. Propertty Management and Disposal Service. An Economic Analysis of the Cobalt Industry. CRA, 1969.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.