1. Balk, B.M. 2003a. Ideal Indices and Indicators for Two or More Factors. Journal of Economic and Social Measurement 28: 203–217.
2. Balk, B.M. 2008. Price and Quantity Index Numbers: Models for Measuring Aggregate Change and Difference. New York: Cambridge University Press.
3. Bosworth, B.P., and J.E. Triplett. 2007. The Early 21st Century U. S. Productivity Expansion is Still in Services. International Productivity Monitor 14: 3–19.
4. De Avillez, R. 2012. Sectoral Contributions to Labour Productivity Growth in Canada: Does the Choice of Decomposition Formula Matter? International Productivity Monitor 24: 97–117.
5. Diewert, W.E. 2010. On the Tang and Wang Decomposition of Labour Productivity Growth into Sectoral Effects. In Price and Productivity Measurement: Volume 6 – Index Number Theory, ed. W.E. Diewert, B.M. Balk, D. Fixler, K.J. Fox, and A.O. Nakamura. Trafford Press, www.vancouvervolumes.com and www.indexmeasures.com.