1. R. W. Hartel , Crystallization in Foods , Aspen Publishers, Inc , Gaithersburg, MD , 2001
2. R. Hilfiker , Polymorphism , Wiley VCH Verlag GMBH& Co. KGaA , Weinheim, Germany , 2006
3. J. Bernstein , Polymorphism in Molecular Crystals , Clarendon Press , Oxford , 2002
4. S. Myerson , Handbook of Industrial Crystallization , Butterworth-Heinemann , Stoneham, MA , 2nd edn, 2002
5. Vanillin: Synthetic Flavoring from Spent Sulfite Liquor