1. Polyamide Fibers in Fiber Chemistry;Levin,1985
2. Caprolactam, product data sheet, Allied Chemical Corp., Moriston, New Jersey, June, 1980; Caprolactam, Standard Test Methods Bulletin, Allied Chemical Corp., New Jersey, June 1980; Caprolactam, Technical Bulletin KL- 42001, Bayer AG, Leverkusen, Germany, (1975) p. 357