Magazines (Variety, Billboard, Broadcasting and others) are important primary sources for Media Studies.
Getting access to and searching within these magazines isn't easy. Online availiblity of these journals is limited, library collections tend to focus on academic journals, not on magazines.
This page offers an overview of the main sources for Media Magazines.
A small number of historical Dutch media magazines have been digitized and made available online. A list of more then 200 Dutch film magazines from the 20th century is available at Cinema Context.