Morrison Robert Thornton, Boyd Robert Neilson (2006). Organic chemistry. Engelwood Cliffs, New Jersey: Prentice Hall. ISBN8120307658.
arkat-usa.org
Oxidation of sulfides to chiral sulfoxides using Schiff base-vanadium (IV) complexes Ángeles Gama, Lucía Z. Flores-López, Gerardo Aguirre, Miguel Parra-Hake, Lars H. Hellberg, and Ratnasamy Somanathan Arkivoc MX-789E 2003Online article
organic-chemistry.org
Clayden Jonathan, Nick Greeves, Stuart Warren, Peter Wothers (2001). Organic chemistry. Oxford, Oxfordshire: Oxford University Press. ISBN0-19-850346-6.