APA-viite (7. p.)
Helfferich, T. (2013). The iron princess: Amalia Elisabeth and the Thirty Years War. Harvard University Press.
Chicago-viite (17. p.)
Helfferich, Tryntje. The Iron Princess: Amalia Elisabeth and the Thirty Years War. Cambridge ; London: Harvard University Press, 2013.
MLA-viite (9. p.)
Helfferich, Tryntje. The Iron Princess: Amalia Elisabeth and the Thirty Years War. Harvard University Press, 2013.
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