[duo797]

The Youkoso book we use in our classroom is the Third Edition, 'Introduction to Contemporary Japanese' or something along those lines. If I could suggest something, also take a look at 'A Dictionary of Basic Japanese Grammar'. I wouldn't try to teach yourself every concept in this book by using this book (other learning materials give more examples and practice) but it's got a lot of good examples/explanations for a lot of basic concepts.