Hewa Saranadasa, “The Square Root of N Plus One Sampling Rule,” Pharmaceutical Technology MAY 2003. 50-62 (2001)
PHARMACEUTICAL INSPECTION CONVENTION PHARMACEUTICAL INSPECTION CO-OPERATION SCHEME, “GUIDE TO GOOD MANUFACTURING PRACTICE FOR MEDICINAL PRODUCTSANNEX 8” 1 January 2017
Food and Agriculture Organization, World Health Organization, GENERAL GUIDELINES ON SAMPLING CAC/GL 50-2004
U.S. Department of Health and Human Services Food and Drug Administration Center for Drug Evaluation and Research (CDER), “Guidance for Industry Investigating Out-of-Specification (OOS) Test Results for Pharmaceutical Production”, October 2006