Columbia University Press, 1981
Buku Teks
Boyd-Barrett, Oliver, author
Constable, 1980
Buku Teks
Guttentag, Jack M., author
Brookings Institution, 1985
Buku Teks
Lanyi, George A.
Random House , 1966
Buku Teks
Giorgio Calcagnini, Ilario Favaretto, editors
[Springer, ], 2012
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