Shader Books
For those who value books like me the following book(pdf) should be helpful although I don't use unity
http://it-ebooks.info/book/2954/
for solid understanding I suggest you also get one of the books I mentioned in @Fengol post "Shader workshop".
http://it-ebooks.info/book/2954/
for solid understanding I suggest you also get one of the books I mentioned in @Fengol post "Shader workshop".