Cita APA (7th ed.)

Birch, W. R., & Cooperman, E. T. (2009). The country seats of the United States. University of Pennsylvania Press.

Cita Chicago (17th ed.)

Birch, William Russell, i Emily T. Cooperman. The Country Seats of the United States. Philadelphia: University of Pennsylvania Press, 2009.

Cita MLA (9th ed.)

Birch, William Russell, i Emily T. Cooperman. The Country Seats of the United States. University of Pennsylvania Press, 2009.