There is no ultimate way to prevent the reuse of your content. There are only methods to deter the less determined, else to help ensure attribution. With that disclaimer and our dose of pragmatism to hand, here are those methods, and the pros and cons of each.
This is a three-pronged deal, the overall task being to clarify your content's source.
This practice may seem odd when applied to a post in its original location, but a title that links to its corresponding post can be very useful when the content has been collared.
In your theme's
single.php file look for this:
And replace that with this: ...