1. A. N. Gubkin: Electrets (Nauka, Moscow 1978) (In Russian)
2. V. V. Gromov: Electricheskit zarriad v obluch mater (Energiya, Moscow 1982)
3. B. Hilczer, J. Malecki: Electrets (Elsevier, Amsterdam 1986)
4. D. A. Seanor (ed.): Electrical Properties of Polymers (Academic, New York 1982)
5. J. Mort, G. Pfister (eds.): Electronic Properties of Polymers (Wiley, New York 1982)