Simulations of system dynamics models are online at isee exchange, isee simulations page for a full list. Models have a user interface, with explanation, and may also be downloaded and run in Stella Architect. Stella can be obtained from isee systems.
Training videos are uploaded on YouTube: see the list on the Video page. There is a video introducing the loop impact method with accompanying notes.
The loop impact method and the Newtonian Interpretive Framework are published in peer-reviewed journals. See the publications page for a full list.