OECD, 1995
Buku Teks
Godfrey, Martin, author
St. Martin's Press, 1985
Buku Teks
Fishman, Betty G., author
Thomas Y. Crowell, 1969
Buku Teks
Pierre, Andrew J., author
Council on Foreign Relations, 1984
Buku Teks
edited by Marina v.N. Whitman ... [and others]
Council on Foreign Relations, 1984
Buku Teks