De Gruyter Praxishandbuch. Berlin, Boston: De Gruyter, n.d.. Web. Retrieved 23 May. 2013, from http://www.degruyter.com/view/serial/182633

De Gruyter Praxishandbuch. (n.d.). Berlin, Boston: De Gruyter. Retrieved 23 May. 2013, from http://www.degruyter.com/view/serial/182633

De Gruyter Praxishandbuch. n.d. Berlin, Boston: De Gruyter. Retrieved 23 May. 2013, from http://www.degruyter.com/view/serial/182633