"Frequenz", 20.2 (1966): 37-68. Retrieved 23 May. 2013, from http://www.degruyter.com/view/j/freq.1966.20.2/issue-files/freq.1966.20.2.xml

Frequenz (1966), 20(2), pp. 37-68. Retrieved 23 May. 2013, from http://www.degruyter.com/view/j/freq.1966.20.2/issue-files/freq.1966.20.2.xml

Frequenz. 1966. 20(2): 37-68. Retrieved 23 May. 2013, from http://www.degruyter.com/view/j/freq.1966.20.2/issue-files/freq.1966.20.2.xml