NFL Career of DL Karl Klug
Neil Cornrich & NC Sports, LLC: September 2013
Pro football: Caledonia's Karl Klug puts NFL career behind him and slides into coaching
TROPHY CASE: Karl Klug, once a Warrior always a Warrior - Post Bulletin
Neil Cornrich & NC Sports, LLC: September 2013
Iowa DL Karl Klug heads to Tennessee Titans (with Klug transcript, analysts quotes)
Neil Cornrich & NC Sports, LLC: October 2013
Tennessee Titans' tough guys Karl Klug tries to keep up with twin
Iowa DL Karl Klug heads to Tennessee Titans (with Klug transcript, analysts quotes)
2010 Iowa Football Media Guide by Iowa Athletics - Issuu
2012 Tennessee Titans Media Guide, PDF, American Football Leagues
2010 Augustana Football Team Yearbook by Tim Evans - Issuu
High school football: Taking a deep dive into southeastern Minnesota's best programs - Post Bulletin
2009 University of North Dakota football media guide by University of North Dakota - Issuu
Hawkeyes' Morgan calls it a career