1. American Society for Quality, ANSI/ISO/ASQ A3534-2, Statistics?vocabulary and symbols, Part 2: Applied statistics, Milwaukee, 2002.
2. Quality control and industrial statistics, 5th edition, R.D. Irwin, Homewood, IL, 1986.
3. International Organization for Standardization, ISO 3534-2, Statistics?vocabulary and symbols, Part 2: Applied statistics, Geneva, Switzerland, 2002.
4. Sequential analysis, Wiley, New York, 1947.