Cita APA (7a ed.)

Frankl, P., O'Gorman, J. F., & Ackerman, J. S. (1968). Principles of architectural history: The four phases of architectural style, 1420-1900. MIT Press.

Cita Chicago Style (17a ed.)

Frankl, Paul, James F. O'Gorman, y James S. Ackerman. Principles of Architectural History: The Four Phases of Architectural Style, 1420-1900. Cambridge (Massachusetts): MIT Press, 1968.

Cita MLA (9a ed.)

Frankl, Paul, et al. Principles of Architectural History: The Four Phases of Architectural Style, 1420-1900. MIT Press, 1968.