Kräutler B (2012). "Biochemistry of B12-cofactors in human metabolism". In Stanger O (ed.). Water Soluble Vitamins. Subcellular Biochemistry. Vol. 56. Dordrecht: Springer Netherlands. pp. 323–346. doi:10.1007/978-94-007-2199-9_17. ISBN978-94-007-2198-2. PMID22116707.
Kräutler B (2012). "Biochemistry of B12-cofactors in human metabolism". In Stanger O (ed.). Water Soluble Vitamins. Subcellular Biochemistry. Vol. 56. Dordrecht: Springer Netherlands. pp. 323–346. doi:10.1007/978-94-007-2199-9_17. ISBN978-94-007-2198-2. PMID22116707.