Staller, M. S., Körner, S., Heil, V. und Kecke, A. (2019) „The Negotiation of Contact and Pain in Pedagogical Settings: Police Recruits Preferred Levels of Contact in Police Use of Force Training“, Journal of Martial Arts Research, 2(1), S. 12. doi: 10.15495/ojs_25678221_21_34.