Foreign Languages Publishing House, 1960
Buku Teks
United Nations, 1979
Buku Teks
Aron, Arthur, author
Prentice-Hall, 1997
Buku Teks
Ugarte, Maria Dolores, author
CRC Press, Taylor & Francis Group, 2008
Buku Teks
Field, Andy P, author
Sage, 2012
Buku Teks