APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Frankl, Paul, James F. O'Gorman, and James S. Ackerman. Principles of Architectural History: The Four Phases of Architectural Style, 1420-1900. Cambridge, Mass. [etc.]: MIT Press, 1968.

MLA (9th ed.) Citation

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