I did

  title = {Foundations for Category Theory},
  author = {Daniel Murfet}
  note  =  {\url{http://therisingsea.org/notes/FoundationsForCategoryTheory.pdf}},
  note = {Accessed: 5-3-2019}

and loaded hyperref in my LaTeX file. It gives this


error. I copied the code from here: How can I use BibTeX to cite a web page? so I don't think there are any typos.


1 Answer 1


Because you gave no complete minimal working example with bibliography (MWEB) I can not test my corrections for you. Please do it yourself and report the result.

You should add the missing comma after author and you should change http:// to https:// in your used url:

  title = {Foundations for Category Theory},
  author = {Daniel Murfet},
  note  =  {\url{https://therisingsea.org/notes/FoundationsForCategoryTheory.pdf}},
  note = {Accessed: 5-3-2019},

The missing comma results in the error message you got.

  • Ugh, facepalm. The comma fixed it, thank you.
    – user388557
    Apr 16, 2019 at 15:40
  • I'm getting a warning -> ignoring extra "note" field
    – Daniel
    Oct 6, 2020 at 9:42
  • using howpublished or url is probably a better idea than using note twice.
    – Daniel
    Oct 6, 2020 at 9:44

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.