When someone copies text from your blog, you can react angrily or first make calm contact. In 2011 I suggested asking them to credit the original source. My reasoning was that a constructive email might start a conversation and a link could lead readers back to the original.
I would now add an important boundary: attribution is not general permission to copy a whole article. According to Auteursrecht.nl, short quotations may be used under conditions, with author and source credited, without separate permission. Larger reproductions may require consent. A link alone does not resolve that.
Record what is there
Keep the URL, date and relevant passages of the copied page. Compare what was actually taken with your own text. Sometimes it is a short quotation in context; sometimes it is nearly the entire article. That difference matters for the appropriate response. Check also whether the other party already had permission or whether it is your own earlier publication.
Write a specific request
Your first message need not be threatening. Identify the page and the text that comes from you, then say what you want: perhaps a correct credit and link for an allowed quote, or removal of an unauthorized reproduction. Give the recipient a reasonable chance to respond. Keep the exchange in writing and avoid a blanket statement that copying is fine as long as someone links.
My older tip focused on the SEO benefit of a link. That is not the first issue. What matters is fair use of your work and clarity for readers. If a friendly request fails, someone knowledgeable about copyright can assess the options. That keeps your response proportionate to what actually happened.