Yes, there are other ways to incorporate CSS into an HTML document. In addition to the <link> element in the head section, you can also include CSS styles directly in the HTML document using the <style> element. Here is an example:

<!DOCTYPE html>
<html>
<head>
  <title>My Page</title>
  <style>
    h1 {
      color: blue;
    }
    p {
      font-size: 18px;
    }
  </style>
</head>
<body>
  <h1>Welcome to my page</h1>
  <p>This is some text on my page.</p>
</body>
</html>

You can also include CSS styles inline in the HTML elements themselves using the style attribute:

<!DOCTYPE html>
<html>
<head>
  <title>My Page</title>
</head>
<body>
  <h1 style="color: blue;">Welcome to my page</h1>
  <p style="font-size: 18px;">This is some text on my page.</p>
</body>
</html>
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