Cita APA (7th ed.)

Williams, H. L., & Williams, O. K. (1966). Great houses of America. Putnam.

Cita Chicago (17th ed.)

Williams, Henry Lionel, i Ottalie K. Williams. Great Houses of America. New York: Putnam, 1966.

Cita MLA (8th ed.)

Williams, Henry Lionel, i Ottalie K. Williams. Great Houses of America. Putnam, 1966.