Routledge, 1993
Buku Teks
Routledge , 1999
Buku Teks
Eric S. Belsky, Christopher E. Herbert, Jennifer H. Molinsky, editors
Brookings Institution Press, 2014
Buku Teks
Vercelloni, Matteo, author
Edizioni L'archivolto, 1996
Buku Referensi
Heinz GaÌ?rtner, Adrian Hyde-Price, Erich Reite, editor
Lynne Rienner Publishers, 2000
Buku Teks