APA (7th ed.) Citation

Gardiner, S. R. (2012). The Thirty Years' War 1618-1648. Project Gutenberg.

Chicago Style (17th ed.) Citation

Gardiner, Samuel Rawson. The Thirty Years' War 1618-1648. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Gardiner, Samuel Rawson. The Thirty Years' War 1618-1648. Project Gutenberg, 2012.

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