Smith, A. D., Hitchens, D. M. W. N., & Davies, S. (1982). International industrial productivity: A comparison of Britain, America and Germany. Cambridge University press.

Smith, A. D., D. M. W. N. Hitchens, and Stephen Davies. International Industrial Productivity: A Comparison of Britain, America and Germany. Cambridge: Cambridge University press, 1982.

Smith, A. D., et al. International Industrial Productivity: A Comparison of Britain, America and Germany. Cambridge University press, 1982.