Verlag Steinbeis-EditionSigrid Friedrichs × Steinbeis 1983-2008 Sigrid FriedrichsSteinbeis-EditioneBook2011 Steinbeis 1983–2008 Sigrid FriedrichsSteinbeis-EditionHardcover2009 Steinbeis 1983-2008 Sigrid FriedrichsSteinbeis-EditionHardcover2008