APA (7th ed.) Citation

Helfferich, T. (2009). The Thirty Years War: A documentary history. Hackett.

Chicago Style (17th ed.) Citation

Helfferich, Tryntje. The Thirty Years War: A Documentary History. Indianapolis [u.a.]: Hackett, 2009.

MLA (8th ed.) Citation

Helfferich, Tryntje. The Thirty Years War: A Documentary History. Hackett, 2009.