edited by Stephan Haggard, Chung H. Lee and Sylvia Maxfield
Cornell University Press, 1993
Buku Teks
Kitchen, Richard L., author
John Wiley & Sons, 1986
Buku Teks
Banco Mundial, 2007
Buku Teks
Hicks, Ursula K., author
Clarendon Press, 1961
Buku Teks
Doris Kohn, editor
[Springer, Springer], 2012
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