I hate to give a bad review but this book really is so bad that I had to get rid of it and warn others about it. I can not imagine what the author was thinking when he wrote it. It just does not cover the topic well at all and any useful information in it is so poorly organized and written that it is mostly just a useless lump of paper. I think I gave my copy away but I should have thrown it in the trash. I am sorry I spent any of my money on it.