I had a similar problem, when I did a paper for my translation-studies ...

We had to translate a text (english->german), and I decided to take a part
of the POV-Ray Doc (3.1g) ...

But as it is common, to give some resources, where the original text could
be obtained, I had to rely on, that the link to the PDF I used, does not
change in the next 2 years ...

I think there is still a bunch out there, where "INTERNET" is not so well
known, and where it is uncommon, to give a resource that is not like

"Author, Book: Vendor, Year, ISBN: pages"

I had to do some really strange discussions to tell them, that:
  "THERE IS NO PRINTED VERSION !"

Post a reply to this message