Hubbard, R. L. (2007). Handbook for preclears. New Era Publications.
Chicago-čujuhus (17. p.)Hubbard, Ron L. Handbook for Preclears. Denmark: New Era Publications, 2007.
MLA-čujuhus (9. p.)Hubbard, Ron L. Handbook for Preclears. New Era Publications, 2007.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.