APA (7th ed.) Citation

Campbell, C. A. (2013). Mary Queen of Scots in History. Project Gutenberg.

Chicago Style (17th ed.) Citation

Campbell, C. A. Mary Queen of Scots in History. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Campbell, C. A. Mary Queen of Scots in History. Project Gutenberg, 2013.

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