What the second floor said is too right! I just started learning DOS too. Maybe it's been a few months now, and I learned it by myself! The day before I went to the bookstore to buy books, my classmate went to Xinhua Bookstore to buy, but couldn't find it. The next day I went by myself and luckily, maybe it's fate that I have with DOS! I actually bought it! (At that time there were only three copies left) It's "DOS Command Encyclopedia" published in 2005. But when I came back, reading it was very tiring, and at that time I was a beginner, so I felt especially tired! Still, reading that super main board's DOS quick start in our place is much better by several times! Really! It was such a pity that I couldn't find this place back then, and I wasted a lot of time reading those! The thing of DOS quick start is really very useful for beginners! Hehe, personal opinion!