Preventing other sites from tracing my site

A person comes to my site from another site and then leaves to another site. That's two websites that just learn of my site address if they use webalizer. The first site this person visited before mine and the site he visited after leaving my site. How do I prevent other sites from finding out about my site address when their visitors come to my site from their site or leave my site to their site?

 

 

 

 

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