APA (7th ed.) Citation

Watson, W. C. (2009). Portuguese Architecture. Project Gutenberg.

Chicago Style (17th ed.) Citation

Watson, Walter Crum. Portuguese Architecture. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Watson, Walter Crum. Portuguese Architecture. Project Gutenberg, 2009.

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