Coombs, Philip H., author
John Hopkins University Press, 1988
Buku Teks
Mahendra Dev, S.
Oxford University Press, 2008
Buku Teks
United Nations , 1997
Buku Teks
Dubhashi, P. R.
Sage Publications, 1986
Buku Teks
Ajwani-Ramchandani, Raji, author
Emerald, 2017
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