Encyclopedia Britannica, via WWW, Oct. 19, 2012 (Les Misérables; novel by Victor Hugo, published in 1862)
Internet movie database, via WWW, Oct. 19, 2012 (film adaptations of story produced in 1909, 1912, 1913, 1917, 1925, 1929, 1934, 1935, 1937, 1944, 1948, 1952, 1957, 1958, 1961, 1967, 1977, 1982, 1995, 1998, and 2012)