1. An Incomplete History and Timeline of Electric Telegraph and CD 731 Compromise Insulator, Hamilton, Ohiohttps://www.insulators.info/shows/handouts/cd_731.pdf
2. A history of Electrical Porcelain Industry in the United States; Printed privately by Jack H. Toddhttps://www.r-infinity.com/ebay/Electrical_Porcelain/Electrical_Porcelain_Adobe.pdf
3. The comparison of ceramic and non-ceramic insulators;Gençoglu;Nat and Appl. Sci. Electr. Eng.,2007
4. History and bibliography of polymeric insulators for outdoor applications
5. The mechanism of the contamination of porcelain insulators;Thompson;J. IEE,1944