APA (7th ed.) Citation

Butler, D., & Story, R. H. (2007). Scottish Cathedrals and Abbeys. Project Gutenberg.

Chicago Style (17th ed.) Citation

Butler, Dugald, and Robert Herbert Story. Scottish Cathedrals and Abbeys. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Butler, Dugald, and Robert Herbert Story. Scottish Cathedrals and Abbeys. Project Gutenberg, 2007.

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