edited by Hamish Main and Stephen Wyn Williams
J. Wiley, 1994
Buku Teks
Third World Network, 1988
Buku Teks
edited by Geoffrey K. Payne
John Wiley & Sons, 1984
Buku Teks
Wiarda, Howard J., author
Thomson/Wadsworth, 2004
Buku Teks
Philippe de Lombaerde
Springer, 2012
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