1.
|
New York, Barnes & Noble [1968]
|
2.
|
New York, Gordian Press, 1968.
|
3.
|
New York, Gordian Press, 1967.
|
4.
|
Minneapolis : University of Minnesota Press, 1930.
|
5.
|
Minneapolis, The University of Minnesota Press, 1930.
|
6.
|
Cambridge, Mass., Harvard university press, 1940.
|
7.
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|