The typical HN convention seems to link directly, or use a zero-indexed footnote. For example, if all you are doing is providing a link, there's no need for ext

The typical HN convention seems to link directly, or use a zero-indexed footnote. For example, if all you are doing is providing a link, there's no need for extra markup: A PDF of "A Disneyland Dilemma": http://people.bath.ac.uk/ecsjgs/Teaching/Industrial%20Organisation/Papers/Oi%20-%20Disneyland%20%281971%29.pdf http://people.bath.ac.uk/ecsjgs/Teaching/Industrial%20Organi... If you are writing more than just the link, it's common to use a zero-indexed footnote: The pdf [0] was originally published by MIT press, and can be found online [.... pretend I wrote more prose] 0: http://people.bath.ac.uk/ecsjgs/Teaching/Industrial%20Organisation/Papers/Oi%20-%20Disneyland%20%281971%29.pdf http://people.bath.ac.uk/ecsjgs/Teaching/Industrial%20Organi...