[1-7] Standards for Scheme -- What are R4RS and IEEE P1178?

R4RS is the Revised^4 Report on the Algorithmic Language Scheme,
edited by W. Clinger and J. Rees. It appeared in ACM Lisp Pointers IV,
July-September 1991, and also as MIT AI Memo 848b. It serves as a kind
of standard for the language. It can be obtained by anonymous ftp at
the two Scheme Repositories, swiss-ftp.ai.mit.edu and ftp.cs.indiana.edu.
A HTML version is available as
   ftp://swiss-ftp.ai.mit.edu/pub/scm/HTML/r4rs_toc.html
or
   http://www.maths.tcd.ie/scrg/scheme/index.html

IEEE P1178 is IEEE Standard 1178-1990, "IEEE Standard for the Scheme
Programming Language", published by IEEE in 1991. ISBN 1-55937-125-0.
It is now also an ANSI standard. It may be ordered from IEEE by
calling 1-800-678-IEEE or 908-981-1393 or writing IEEE Service
Center, 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08855-1331, 
and using order number SH14209 ($28 for IEEE members, $40 others).