How people link naturally
 

People link naturally by:

Attribution
Citation
Definition
Expansion
Identification
Example
Action
Relationship

So try to use any of this

Megri, I completely agree with you that they are the necessities to generate link naturally, additionally we can Write articles that are related to our service or product, we can make genuine comments on blogs, participate in forum discussions and last but not the least use Web 2.0 as they are also addressed as mini-websites which surely helps us in creating links naturally.