Guthrie 2003, pp. 72, 73. Guthrie, William P (2003), "Appendix F:The Action at Vlotho, October 17, 1638", The Later Thirty Years War: From the Battle of Wittstock to the Treaty of Westphalia, Contributions in Military Studies, vol. 222 (illustrated ed.), Greenwood Publishing Group, pp. 72, 73, ISBN9780313324086
