There I find the textbooks in question, but I can not find it. Before leaving, I saw a bookshelf whose content theme of the blog, I was interested in and eventually buy the book. Although I can not find the book my teacher is essential I bought the book useful for my future, and it proved to fit me to go to college in CCIT - FT UI , Depok. And in the end, I became a writer of useful knowledge in my blog today, because of our blog to get knowledge and experience invaluable. Spirit ...!