"Frequenz", 16.5 (1962): 161-200. Retrieved 22 May. 2013, from http://www.degruyter.com/view/j/freq.1962.16.5/issue-files/freq.1962.16.5.xml

Frequenz (1962), 16(5), pp. 161-200. Retrieved 22 May. 2013, from http://www.degruyter.com/view/j/freq.1962.16.5/issue-files/freq.1962.16.5.xml

Frequenz. 1962. 16(5): 161-200. Retrieved 22 May. 2013, from http://www.degruyter.com/view/j/freq.1962.16.5/issue-files/freq.1962.16.5.xml