"Archiv für Geschichte der Philosophie", 51.1 (1969): 1-109. Retrieved 21 May. 2013, from http://www.degruyter.com/view/j/agph.1969.51.issue-1/issue-files/agph.1969.51.issue-1.xml

Archiv für Geschichte der Philosophie (1969), 51(1), pp. 1-109. Retrieved 21 May. 2013, from http://www.degruyter.com/view/j/agph.1969.51.issue-1/issue-files/agph.1969.51.issue-1.xml

Archiv für Geschichte der Philosophie. 1969. 51(1): 1-109. Retrieved 21 May. 2013, from http://www.degruyter.com/view/j/agph.1969.51.issue-1/issue-files/agph.1969.51.issue-1.xml