Der Betriebswirt, Vol. 54 (2013), Iss. 4 : pp. 31–35 | First published online: June 26, 2019
Sozialer Fortschritt, Vol. 58 (2009), Iss. 4 : pp. 63–69 | First published online: October 03, 2017
Vierteljahrshefte zur Wirtschaftsforschung, Vol. 73 (2004), Iss. 4 : pp. 579–588 | First published online: October 03, 2017
Der Betriebswirt, Vol. 55 (2014), Iss. 4 : pp. 16–21 | First published online: June 05, 2019
Der Betriebswirt, Vol. 52 (2011), Iss. 3 : pp. 27–30 | First published online: July 09, 2019