== See also ====References====Further reading==* Barker, Eileen "" (1984)* Barrett, D. V. "The New Believers: A survey of sects, cults and alternative religions" (2001) UK, Cassell & Co ISBN 0-304-35592-5* Cooper, Richard S. "The Assessment and Collection of Kharaj Tax in Medieval Egypt" "Journal of the American Oriental Society", Vol.
" (1984)* Barrett, D. V. "The New Believers—A survey of sects, cults and alternative religions" (2001) UK, Cassell & Co [http://www.thenewbelievers.com/]* Cooper, Richard S. «The Assessment and Collection of Kharaj Tax in Medieval Egypt» ("Journal of the American Oriental Society", Vol.