APA (7th ed.) Citation

Carlyle, T. (2008). History of Friedrich II of Prussia - Volume 21. Project Gutenberg.

Chicago Style (17th ed.) Citation

Carlyle, Thomas. History of Friedrich II of Prussia - Volume 21. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Carlyle, Thomas. History of Friedrich II of Prussia - Volume 21. Project Gutenberg, 2008.

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