Further reading
- (NB. Includes entire syntax of PL/M in BNF notation.)
- [https://web.archive.org/web/20231125032320/https://00362628054895325210.googlegroups.com/attach/1cc719e8305ed/burgett.txt?part=0.1&view=1&vt=ANaJVrFYjqMX6NCUFa_l-LUDCL-Mu3EqJS1xO4wZczmxImZg2kP3F8E1qEWYTXI5rHv6URyeMi3pcc1oH5LeyEkzHUSeSnUncsii1D7SyIa5EcFQPzu1fzM]2017 Ken Burgett interview about development of intel ISIS Operating System
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