Hammond, C.R. "Polonium" December 8, 1997 http://darkhelmet.scu.edu/martha/periodic/84.html (February 7, 2000)
CST Information Services Team. "Polonium"Periodic Table December 19, 1997http://pearl1.lanl.gov/periodic/elements/84.html February 5, 2000
Heilman, Chris. "Polonium"The Pictoral Periodic Table February 6, 1998http://chemlab.pc.maricopa.edu/periodic/po.html(February 7, 2000)
Earth Science Associates. "Polonium Halos" 1999 http://www.halos.com (February 7, 2000)
Picture of brush:
http://www.2spi.com/catalog/photo/statmaster.html