Barlow, Richard E. (1998). Engineering reliability. ASA-SIAM Series on Statistics and Applied Probability. Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA; American Statistical Association, Alexandria, VA. pp. xx+199. ISBN0-89871-405-2. MR1621421.
The Editors of Encyclopaedia Britannica. "Slide Rule". Encyclopaedia Britannica. Encyclopaedia Britannica Inc. Retrieved 17 April 2018. {{cite web}}: |last1= has generic name (help)