1. ANSI/ASQC Z1.9 (1980): Sampling Procedures and Tables for Inspection by Variables for Percent Nonconforming, American Society for Quality Control Milwaukee, Wisconsin.
2. BLACKWELL, D. (1947): Conditional expectation and unbiased sequential estimation, Annals of Mathematical Statistics, 18, 105–110.
3. BS 6002 (1979): Sampling procedures and charts for inspection by variables for percent defective,. British Standards Institution, London.
4. GRAYBILL, F.A. (1969): Introduction to Matrices with Applications in Statistics, Wadsworth, Belmont, California. 115
5. ISO 3951 (1981): Sampling procedures and charts for inspection by variables for percent defective, International Organization for Standardization, Geneva, Switzerland