If you want that your content get linked naturally  you must do following things:

1. write the current topic.
2. make it resource not just an article.
3. Use simple way to explain the topic.
4. be specific and point to point.
5. Include real time examples.
6. Never write fake things.

i believe the end one could give you natural link only and only after it seem you reliable. So, whatever you send should have personalized touch and unique consistency. Your content should be meaningful and on the benefited for both perspectives user and search engine. There are many free resources on the web that you can use for getting natural link.