Elzinga, Kenneth G., author
Yale University Press, 1976
Buku Teks
Posner, Richard A., author
The University of Chicago, 1976
Buku Teks
Calvani, Terry, author
Little, Brown, 1988
Buku Teks
Fox, Eleanor M., author
Thomson Reuters, 2010
Buku Teks
Hylton, Keith N, Author
Cambridge University Press, 2003
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