Selected references for communicating effectively with a range of audiences
How to give a good research talk, Simon Peyton Jones, John Launchbury, John Hughes, SIGPLAN Notices 28(11), Nov 1993. (and the references thereof)
Mathematical Writing, Donald E. Knuth, Tracy Larrabee, and Paul M. Roberts. tex.loria.fr/typographie/mathwriting.pdf
The Elements of Style: A Style Guide for Writers (2005), by William Strunk.
The Elements of Style by William Strunk Jr. & How To Speak And Write Correctly, by Joseph Devlin (2006), BN Publishing,