Although we don't have much context here, it seems very unlikely that "titres" refers only to newspapers. Weekly, monthly or quarterly publications are almost certainly magazines or journals. The generic term for all these things is periodicals; more technically, they can all be called serials. Some people would distinguish newspapers from periodicals. But in any case, the word "titles" can be and commonly is used to refer to periodical publications, particularly in a commercial context, and I would recommend using it here.

"Although specialized, many of Intertec's titles have more than 100,000 subscribers which is an amazing number for a trade magazine. [...]
Some of its largest titles include Macworld, InfoWorld, Network World, Channel World, [...]"
http://tradewriter.freeservers.com/sample.htm