const options = {
  method: 'PATCH',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({references: [{title: '<string>', url: '<string>'}]})
};

fetch('https://studyfetchapi.com/api/v1/materials/{id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "_id": "<string>",
  "name": "<string>",
  "organizationId": "<string>",
  "folderId": "<string>",
  "contentType": "text",
  "content": {
    "text": "<string>",
    "url": "<string>",
    "s3Key": "<string>",
    "s3Url": "<string>",
    "filename": "<string>",
    "fileSize": 123,
    "mimeType": "<string>"
  },
  "status": "active",
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z",
  "metadata": {},
  "usage": {},
  "references": [
    {
      "title": "Understanding Photosynthesis",
      "url": "https://example.com/article"
    }
  ]
}