edited by Victor A. Hauser
Oxford University Press, 1986
Buku Teks
edited by H.S. Geyer
Edward Elgar, 2011
Buku Teks
Meier, Gerald M., author
Oxford University Press, 1984
Buku Teks
Lyon, Leverett S., author
The Brookings Institution, 1940
Buku Teks
Wickramasinghe, Nilmini, editor
Springer, 2012
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