7[3]Snyder, T.D., Hoffman, C.M., Geddes, C.M.(1997) . Digest of Education Statistics[Z] . National Central for Education Statistics, Washington D.C . 1997 .
8[4]Snyder, T.D., Hoffman, C.M. and Geddes, C.M. (1997) . Digest of Education Statistics[Z] . 1997 .
9[5]Morton Bahr . Lifelong Learning at its Best . Jossey Bass Inc- Publishers, 2000 . 24, 7 .
10[6]A.Tuijnman and T. Schuller . Lifelong Learning Policy and Researcher[M] . London: Published by Poland place Ltd.135.
