Furfari, F.A. (2001). "A different kind of chemistry: A history of tungsten halogen lamps". IEEE Industry Applications Magazine. 7 (6): 11. Bibcode:2001IIAM....7f..10F. doi:10.1109/2943.959111.
Furfari, F.A. (2001). "A different kind of chemistry: A history of tungsten halogen lamps". IEEE Industry Applications Magazine. 7 (6): 11. Bibcode:2001IIAM....7f..10F. doi:10.1109/2943.959111.
"Tungsten Halogen - Double Jacket". Lamptech.co.uk. 14 September 2014. Retrieved 23 January 2019. Source has illustrations of various double-envelope halogen bulbs.