Audio.
It is a self-study reference and practice book (with answers) for elementary students of English by Raymond Murphy. Second edition. Audio
The most important features of this book are:
It is a grammar book. It deals only with grammar and is not a general course book.
It is a book for elementary learners. It does not cover areas of grammar which are not normally taught at elementary level.
It combines reference and exercises in one volume.
It can be used for self-study or as supplementary course material.