Where to Find Content for your E-Newsletters, and How to Use It
I am amazed by the number of places you can find content for your newsletter. Some of it takes the form of free articles. Some of it you pay for, and can request any kind of content you like. One way or another, whatever your industry and the focus of your e-newsletter, there are plenty of places to get good content for every issue you send.
Usborne, Nick. Excess Voice (2007). Articles>Business Communication>Writing>Newsletters