You also could get good information in the manufacturer literature and catalogs. Check on the following manufacturer website such as LAPP, Sediver, Santana, NKG, Hubbell, etc
Here is a partial reference list in HV insulator:
o Looms, J.S.T. “Insulators for high voltages, Collection IEE Power Engineering Series
o Andrew R Hileman , Insulation Coordination for Power Systems
o Gorur, Ravi S.; Cherney, Edouard A. ; Burnham, Jeffrey T. “Outdoor insulators”
o Manual of Westinghouse Outdoor BushingsTechnical Data 33-360.
o Martin Heathcote, The J & P Transformer Book
o Apparatus Bushing Reference Book, Gen-eral Electric Co., Bulletin GET- 2525.
o NEMA Publication No. 107-1964, Reaffirmed by NEMA 1976 - Methods of Measurement of Radio Influence Voltage (RIV) of High-Voltage Apparatus, National Electrical Manufacturers Association, 2101 L Street NW, Washington, D.C. 20037.
o IEEE Standard 21-1976 - IEEE General Re-quirements and Test Procedure for Outdoor Apparatus Bushings, Published by the Institute of Electrical and Electronic Engineers, Inc.
o IEC Std 273
o Hubert, Charles L., Preventive Maintenanceof Electrical Equipment, McGraw-Hill Book Co., New York, N.Y., 1969.