Bottomley, J., Barton, C., Cooley, R., Dasey, R., Duggan, A., Dunworth, J., . . . Pickford, M. (1972). Costs and potential economies. Paris FR: Organisation for Economic Co-operation and Development.

Bottomley, J.A., C.A Barton, R.E Cooley, R.M Dasey, A. Duggan, J.E Dunworth, R.K Khanna, and M. Pickford. Costs and Potential Economies. Paris FR: Organisation for Economic Co-operation and Development, 1972.

Bottomley, J.A., et al. Costs and Potential Economies. Paris FR: Organisation for Economic Co-operation and Development, 1972.