The srfi document has the following references:
Neither of the links work any more.
Thanks for reporting these. I've replaced the broken links with links to the corresponding Wikipedia entries. Those are likely to remain stable for a long time, and I expect that their references will be kept up to date, too. I also fixed a broken link to the email archive for this SRFI.
As a side-note, the reference to the scheme although correct, may be,
perhaps extended to also include the R^7RS.
Since R7RS didn't exist at the time that SRFI 1 was published, I haven't made that change.
Thanks again for reporting these. It's much more satisfying for readers of the SRFI if all the links actually work.