1.
|
New York : Nova Science Publishers, c2009.
|
2.
|
New York : John Day Co., c1961.
|
3.
|
Madison : University of Wisconsin Press, 1975.
|
4.
|
Berkeley : University of California Press, 1974.
|
5.
|
Dubuque, Iowa, W. C. Brown Co. [1962]
|
6.
|
Boston, Houghton Mifflin [1968]
|
7.
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Madison, University of Wisconsin Press, 1965.
|