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The Assessment of Uncertainty in Radiological Calibration and Testing,
National Physical Laboratory, Measurement Good Practice Guide No.49,  NPL, 2003.

Guide to the Expression of Uncertainty in Measurement.
BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML.
ISO, Geneva, Switzerland. ISBN 92-67-10188-9,
First Edition 1993, corrected and reprinted 1995.

The Expression of Uncertainty and Confidence in Measurement.
Edition 1, December 1997.
UKAS Publication M3003. 

A Beginner’s Guide to Uncertainty of Measurement
NPL Measurement Good Practice Guide No. 11, 1999