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2. International Standard ISO/DIS 11608-1.3 (1998). Pen-injectors for medical use — Part 1: Requirements and test methods. International Organization for Standardization, Geneva
3. International Standard ISO 3951 (1989). Sampling procedures and charts for inspection by variables for percent nonconforming. International Organization for Standardization, Geneva
4. Liebermann, G. J., Resnikoff, G. J. (1955). Sampling plans for inspection by variables. Journal of the American Statistical Association 50, 457–516
5. Military Standard MIL-STD-414 (1957). Sampling procedures and tables for inspection by variables for percent defective. United States Government Printing Office, Washington, D.C.