1. Tannin Chemistry;Hagerman,2002
2. https://www.fs.fed.us/wildflowers/ethnobotany/tannins.shtml.
3. Wood Bark as Valuable Raw Material for Compounds with Biological Activity;Popa,2015
4. Phenolic and tannin-based adhesive resins by reactions of coordinated metal ligands. II. Tannin adhesive preparation, characteristics, and application;Pizzi;J. Appl. Polym. Sci.,1979
5. Condensed tannins in adhesives;Hergert,1989