Cita APA (7a ed.)

Penoyre, J., & Ryan, M. (1958). The observer's book of architecture. Frederick Warne & Co.

Cita Chicago Style (17a ed.)

Penoyre, John, y Michael Ryan. The Observer's Book of Architecture. London, New York: Frederick Warne & Co, 1958.

Cita MLA (9a ed.)

Penoyre, John, y Michael Ryan. The Observer's Book of Architecture. Frederick Warne & Co, 1958.