Most of the vocabulary is from Teach Yourself Complete Polish, which can be purchased at a very good price at Amazon or eBay. Much of the audio for the vocabulary is taken from forvo.com and many thanks to memriser 'xplkqlkcassia' for most of the rest :).
Update: I realized that 'xplkqlkcassia' added more audio than I thought. Apparently, I remembered that I got lazy and didn't get to adding audio to the later sections. So, 'xplkqlkcassia' really is owed a lot more credit here. Thanks!