X cités by Georgia de Chamberet - 1999 - 263 pages
X-1 by Harry Smith, Thomas Tolnay, Anne C. Heller - 1976 - 232 pages
X-Changes by Anna Fienberg, Fienberg Nix - 2000 - 216 pages
Xala by Ousmane Sembène - 1983 - 103 pages
XUN - TB 02 by Bernd Walter - 2009 - 106 pages