Greenwood, Ned H., author
Duxbury Press, 1979
Buku Teks
Hawley, Amos H., author
The Ronald Press, 1950
Buku Teks
Hodder, Ian, author
International Thomson, 1995
Buku Teks
Kemp, David D., author
Routledge , 2004
Buku Teks
Reitz, Elizabeth J., 1946-
Springer, 2012
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