Smulders, E.; von Rybinski, W.; Sung, E.; Rähse, W.; Steber, J.; Wiebel, F.; Nordskog, A. (2011). "Laundry Detergents, 1. Introduction". In Elvers, Barbara; et al. (eds.). Ullmann's Encyclopedia of Industrial Chemistry. Weinheim, GER: Wiley-VCH. doi:10.1002/14356007.a08_315.pub3. ISBN978-3527306732.
Jelinek, Charles F.; Mayhew, Raymond L. (September 1954). "Nonionic Detergents". Industrial & Engineering Chemistry. 46 (9): 1930–1934. doi:10.1021/ie50537a045.
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A US patent 1970578 A, Schoeller, Conrad & Wittwer, Max, "Assistants for the textile and related industries", issued 1934-08-21, assigned to IG Farbenindustrie AG
