Siegmund Gabriel, Theodor A. Maass:Ueber ε‐Amidocapronsäure. In: Berichte der deutschen chemischen Gesellschaft. Band32, 1899, S.1266–1272, doi:10.1002/cber.189903201205.
Ann-Joelle Minor, Ruben Goldhahn, Liisa Rihko-Struckmann, Kai Sundmacher:Chemical Recycling Processes of Nylon 6 to Caprolactam: Review and Techno-Economic Assessment. In: Chemical Engineering Journal. Band474, 2023, S.145333, doi:10.1016/j.cej.2023.145333.
Gerd Dahlhoff, John P. M. Niederer, Wolfgang F. Hoelderich:ϵ-Caprolactam: new by-product free synthesis routes. In: Catalysis Reviews. Band43, Nr.4, 2001, S.381–441, doi:10.1081/CR-120001808.