1. A. D. Covington , Tanning chemistry: The science of leather , Royal Society of Chemistry , Cambridge , 2011
2. M. Black , M.Canova , S.Rydin , B. M.Scalet , S.Roudier and L.Delgado , Best Available Techniques (BAT) Reference Document for the Tanning of Hides and Skins, JRC Reference Reports (European Commission) , Luxembourg , 2013
3. Green chemistry approaches to leather tanning process for making chrome-free leather by unnatural amino acids
4. E. Heidemann , Fundamentals of Leather Manufacturing , Eduard Roether K.G. , Darmstadt , 1993
5. Ionic liquids: new age materials for eco-friendly leather processing