A phenomenal writing book that I recommend to everyone is Writing Tools: 55 Essential Strategies for Every Writer by Roy Peter Clark.
In this exquisitely and delightfully written book, Mr. Clark shows us how to understand and elevate our writing, even down to the last punctuation mark. For just $7.99 (the last time I checked), this book will change your writing life! I've bought several as gifts.
For students who already love writing, this book will probably blow your mind with its tips and insight. Mr. Clark loves words just as much as you do!
This book is my writing bible. :)