Chosen at random from all the resources listed:
- Systems One : An Introduction to Systems Thinking by Draper L. Kauffman
- Writing Better Requirements by Richard Stevens, Ian F. Alexander
- Military Electronic Systems Engineering MSc/PgDip by -- Uknown -- -- Uknown --
- Requirements Engineering - A Good Practice Guide by Ian Somerville, Pete Sawyer
- UML for Systems Engineering (Second Edition) by Jon Holt