Cita APA (7th ed.)

Helm, D., & Jenkinson, T. (1998). Competition in regulated industries. Oxford University Press.

Cita Chicago (17th ed.)

Helm, Dieter, i Tim Jenkinson. Competition in Regulated Industries. Oxford: Oxford University Press, 1998.

Cita MLA (9th ed.)

Helm, Dieter, i Tim Jenkinson. Competition in Regulated Industries. Oxford University Press, 1998.