One new paper I particularly recommend to people who want to teach and explore stocks and flows ("bathtub dynamics") is
CRONIN, M. A., GONZALEZ, C. & STERMAN, J. D. (2009) Why Don't Well-Educated Adults Understand Accumulation? A Challenge to Researchers, Educators, and Citizens.Organizational Behavior and Human Decision Processes 108:(1): 116-130.
available on my website at http://jsterman.scripts.mit.edu/On-Line_Publications.html