Baumol, W. J. 1., Oates, W. E. 1., Bawa, V. S., Bradford, D. F., & Oates, W. E. (1988). The Theory of environmental policy (2nd ed.). Cambridge: Cambridge University Press.

Baumol, W. J. 1922-, Wallace E. 1937- Oates, V. S. Bawa, David F. Bradford, and Wallace E. Oates. The Theory of Environmental Policy. 2nd ed. Cambridge: Cambridge University Press, 1988.

Baumol, W. J. 1922-, et al. The Theory of Environmental Policy. 2nd ed. Cambridge: Cambridge University Press, 1988.