1. Ullmann's Encyclopedia of Industrial Chemistry: Maleic and Fumaric Acids 2005
2. Maleic Anhydride 2011 http://chemical.ihs.com/CEH/Public/Reports/672.5000/
3. M. Becker J. Walden 1989
4. J. C. Burnett W. H. Alumbough L. A. Reeves 2001
5. J. R. Ebner 1993