Παραπομπή APA

Helberger, N. (2005). Controlling access to content: Regulating conditional access in digital broadcasting. Kluwer law international.

Παραπομπή Chicago Style

Helberger, Natali. Controlling Access to Content: Regulating Conditional Access in Digital Broadcasting. Netherlands: Kluwer law international, 2005.

Παραπομπή MLA

Helberger, Natali. Controlling Access to Content: Regulating Conditional Access in Digital Broadcasting. Kluwer law international, 2005.