What’s The Best Japanese Textbook For Self Study?

The Japanese textbook book I always recommend  to my students for their self-study is Basic Japanese Sentence Patterns by Naoko Chino published by Kodansha. I think it's the best Japanese textbook for self study.
 
It's a fantastic addition to a more general Japanese textbook that teaches grammar, vocabulary and kanji all together like "Mina No Nihongo" or whatever your teacher uses. There are only three types of Japanese sentence, and Chino-sensei explains the basic 50 patterns and all the variations.

You can read a full review here: http://www.bestjapanesetextbooks.com/basic-japanese-sentence-patterns/