Spies, M., 2015. Helfferich, The Iron Princess: Amalia Elisabeth and the Thirty Years War (Harvard University Press, 2013). Royal Studies Journal, 2(1), pp.35–36. DOI: http://doi.org/10.21039/rsj.v2i1.41

Spies M. Helfferich, The Iron Princess: Amalia Elisabeth and the Thirty Years War (Harvard University Press, 2013). Royal Studies Journal. 2015;2(1):35–6. DOI: http://doi.org/10.21039/rsj.v2i1.41

Spies, M. (2015). Helfferich, The Iron Princess: Amalia Elisabeth and the Thirty Years War (Harvard University Press, 2013). Royal Studies Journal, 2(1), 35–36. DOI: http://doi.org/10.21039/rsj.v2i1.41

Spies M, ‘Helfferich, the Iron Princess: Amalia Elisabeth and the Thirty Years War (harvard University Press, 2013)’ (2015) 2 Royal Studies Journal 35 DOI: http://doi.org/10.21039/rsj.v2i1.41

Spies, Martin. 2015. “Helfferich, the Iron Princess: Amalia Elisabeth and the Thirty Years War (harvard University Press, 2013)”. Royal Studies Journal 2 (1): 35–36. DOI: http://doi.org/10.21039/rsj.v2i1.41

Spies, Martin. “Helfferich, the Iron Princess: Amalia Elisabeth and the Thirty Years War (harvard University Press, 2013)”. Royal Studies Journal 2, no. 1 (2015): 35–36. DOI: http://doi.org/10.21039/rsj.v2i1.41

Spies, M.. “Helfferich, the Iron Princess: Amalia Elisabeth and the Thirty Years War (harvard University Press, 2013)”. Royal Studies Journal, vol. 2, no. 1, 2015, pp. 35–36. DOI: http://doi.org/10.21039/rsj.v2i1.41