University of Maryland, College Park. Bureau of Business and Economic Research. (1949). Baltimore: some economic indicators: Comparisons with other cities, relation to State of Maryland.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)University of Maryland, College Park. Bureau of Business and Economic Research. Baltimore: Some Economic Indicators: Comparisons with Other Cities, Relation to State of Maryland. College Park, 1949.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)University of Maryland, College Park. Bureau of Business and Economic Research. Baltimore: Some Economic Indicators: Comparisons with Other Cities, Relation to State of Maryland. 1949.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.