Breck, S. (1818). Sketch of the internal improvements already made by Pennsylvania: With observations upon her physical and fiscal means for their extension; particularly as they have reference to the future growth and prosperity of Philadelphia. J. Maxwell, Printer.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Breck, Samuel. Sketch of the Internal Improvements Already Made by Pennsylvania: With Observations upon Her Physical and Fiscal Means for Their Extension; Particularly as They Have Reference to the Future Growth and Prosperity of Philadelphia. Philadelphia: J. Maxwell, Printer, 1818.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Breck, Samuel. Sketch of the Internal Improvements Already Made by Pennsylvania: With Observations upon Her Physical and Fiscal Means for Their Extension; Particularly as They Have Reference to the Future Growth and Prosperity of Philadelphia. J. Maxwell, Printer, 1818.