Natural are of more value to search engines than reciprocal as they are harder to get.
They are somewhat of a popularity contest. If people like your site and they like your content, they want to share your information with the world.
They can increase your ranking on search engines and get new people to find your site.
- write an article - if you do not have your own ( up to 150 words short, up to 500 words long)
- rewrite it in order (basic and standard)
- add the desired Hyperlinks
- Publish in search-engine friendly sites
- Plus extra...