Circuit Components Inc. "Filtering and Surge Suppression Fundamentals"(PDF). Circuit Components Inc. Archived from the original(PDF) on 2010-12-13. Retrieved 2011-03-29. Includes extensive comparison of design tradeoffs among various surge suppression technologies.
http://lightningsafety.com/nlsi_lhm/IEEE_Guide.pdf, How to Protect Your House and Its Contents from Lightning | IEEE Guide for Surge Protection of Equipment Connected to AC Power and Communication Circuits | 2005.
"About UL". UL.com. 18 July 2014. Retrieved 18 January 2018.
Underwriters Laboratories. "Application Guideline". UL 6500 – Second Edition. Archived from the original on 2011-07-16. Retrieved 2011-03-29. Connection of MOVs and GDTs in series.
Circuit Components Inc. "Filtering and Surge Suppression Fundamentals"(PDF). Circuit Components Inc. Archived from the original(PDF) on 2010-12-13. Retrieved 2011-03-29. Includes extensive comparison of design tradeoffs among various surge suppression technologies.
Underwriters Laboratories. "Application Guideline". UL 6500 – Second Edition. Archived from the original on 2011-07-16. Retrieved 2011-03-29. Connection of MOVs and GDTs in series.