Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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