"Frequenz", 43.2 (1989): 33-64. Retrieved 19 May. 2013, from http://www.degruyter.com/view/j/freq.1989.43.2/issue-files/freq.1989.43.2.xml

Frequenz (1989), 43(2), pp. 33-64. Retrieved 19 May. 2013, from http://www.degruyter.com/view/j/freq.1989.43.2/issue-files/freq.1989.43.2.xml

Frequenz. 1989. 43(2): 33-64. Retrieved 19 May. 2013, from http://www.degruyter.com/view/j/freq.1989.43.2/issue-files/freq.1989.43.2.xml