"Frequenz", 40.2 (1986): 25-52. Retrieved 19 Jun. 2013, from http://www.degruyter.com/view/j/freq.1986.40.2/issue-files/freq.1986.40.2.xml

Frequenz (1986), 40(2), pp. 25-52. Retrieved 19 Jun. 2013, from http://www.degruyter.com/view/j/freq.1986.40.2/issue-files/freq.1986.40.2.xml

Frequenz. 1986. 40(2): 25-52. Retrieved 19 Jun. 2013, from http://www.degruyter.com/view/j/freq.1986.40.2/issue-files/freq.1986.40.2.xml