1. U.S. Department of Health and Human Services Food and Drug Administration Center for Drug Evaluation and Research (CDER) PET Drugs - Current Good Manufacturing Practice (CGMP) 2009
2. U.S. Department of Health and Human Services Food and Drug Administration, FDA Guidance for Industry Q7A Good Manufacturing Practice for Active Pharmaceutical Ingredients (APIs) 2001
3. European Commission: Volume 4 of “The rules governing medicinal products in the European Union” Part II-Basic Requirements for Active Substances used as Starting Materials 2014