1. Biologic Activity of ε-Caprolactam
2. National Cancer Institute (NCI)/National Toxicology Program (NTP) „Carcinogenesis Bioassay of Caprolactam, F-344 rats and B6C3F1 mice (feed study)” 214 USDHHS 1982
3. “Rules and regulations, Caprolactam”;Occupational Safety and Health Administration (OSHA);Fed. Reg.,1989