Cita APA (7th ed.)
Helfferich, T. (2013). The iron princess: Amalia Elisabeth and the Thirty Years War. Harvard University Press.
Cita Chicago (17th ed.)
Helfferich, Tryntje. The Iron Princess: Amalia Elisabeth and the Thirty Years War. Cambridge ; London: Harvard University Press, 2013.
Cita MLA (9th ed.)
Helfferich, Tryntje. The Iron Princess: Amalia Elisabeth and the Thirty Years War. Harvard University Press, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.