APA (7th ed.) Citation

Sharpe, E., & Austin, T. (2012). The Seven Periods of English Architecture Defined and Illustrated. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sharpe, Edmund, and T. Austin. The Seven Periods of English Architecture Defined and Illustrated. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Sharpe, Edmund, and T. Austin. The Seven Periods of English Architecture Defined and Illustrated. Project Gutenberg, 2012.

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