title: Latex: reference.bib shows reference number without reference text
body: <p>my reference.bib page shows the last reference in the list [150] with no reference in text. Notice, there is no duplication in citation and in reference.bib since I removed all duplications in reference page and in chapters. Please help me. I uses \bibliography{BIBLIOGRAPHY}
  \bibliographystyle{unsrt} as my grad school requirement</p>
  <p>I attached the reference page:</p>
  <p><a href="https://i.stack.imgur.com/MlKHx.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/MlKHx.jpg" alt="enter image description here" /></a></p>
  <p>reference page:</p>
  <pre><code>https://drive.google.com/file/d/1x13qtAEISvwBOw5kmN9CZ3D4lHa5gXN9/view?usp=sharing
  </code></pre>