The only problem with LiSP is the price! I recommend PLAI (<a href="https:&#x2F;&#x2F;cs.brown.edu&#x2F;~sk&#x2F;Publications&#x2F;Books&#x2F;ProgLangs&#x2F;" rel="nofollow">https:&#x2F;&#x2F;cs.brown.edu&#x2F;~sk&#x2F;Publications&#x2F;Books&#x2F;ProgLangs&#x2F;</a>) if you dont have the money to spend.