If you have attended a Level 1 course through the ITC, look on your ITC Utility CD under the "Technical Documents" heading for the list of reference books. If you don't have that, here are just a few that I like:
Common Sense Approach to Thermal Imaging
by Gerald Holst
You can find it here: http://www.jcdpublishing.com/
Also, any of the Proceedings manuals from the past Inframation conferences are excellent sources of application and science for the infrared world.
http://www.infraredtraining.com/store/
Hope this helps, and good luck to you on your quest for Level 2.
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