1. UNIC, Sustainability Report, 2021. https://unic.it/storage/2021-Sustainability_Report_UNIC.pdf.
2. Sludge from tannery industries;Wystalska,2019
3. Sustainable use of tannery sludge in brick manufacturing in Bangladesh;Juel;Waste Manage.,2017
4. European Commission. Joint Research Centre. Institute for Prospective Technological Studies., Best available techniques (BAT) reference document for the tanning of hides and skins: Industrial Emissions Directive 2010/75/EU (integrated pollution prevention and control)., Publications Office, LU, 2013. https://data.europa.eu/doi/10.2788/13548 (accessed September 28, 2022).
5. E. Kiliç, R. Puig, G. Baquero, J. Font, S. Çolak, D. Gürler, Environmental optimization of chromium recovery from tannery sludge using a life cycle assessment approach, Journal of Hazardous Materials. (2011) S0304389411006790. Doi:10.1016/j.jhazmat.2011.05.040.