Cita APA (7th ed.)

Train, K. (1991). Optimal regulation: The economic theory of natural monopoly. MIT Press.

Cita Chicago (17th ed.)

Train, Kenneth. Optimal Regulation: The Economic Theory of Natural Monopoly. Cambridge, Mass: MIT Press, 1991.

Cita MLA (9th ed.)

Train, Kenneth. Optimal Regulation: The Economic Theory of Natural Monopoly. MIT Press, 1991.