1995 Standard MUMPS Pocket Guide (fifth edition)
Written by Frederick D. S. Marshall.
This convenient reference—a condensed summary of M syntax and conventions—is an irreplaceable resource for M programmers (including Vista developers), and has the luxury of being portable, readable, annotatable—and not subject to power failures.
This was our first book. It remains popular, and we wound up selling enough copies to recoup our printing costs and other expenses, so we’ve made it available as a free download as well.
Softcover, 72 pages
Fifth edition, published 2010