APA (7th ed.) Citation

Frankl, P. (1963). Gothic architecture. Penguin Books.

Chicago Style (17th ed.) Citation

Frankl, Paul. Gothic Architecture. Baltimore: Penguin Books, 1963.

MLA (9th ed.) Citation

Frankl, Paul. Gothic Architecture. Penguin Books, 1963.

Warning: These citations may not always be 100% accurate.