If you are looking for a good sushi cookbook to buy, here is a list of sushi books which might help you.
1. The Great Sushi and Sashimi Cookbook
By Kazu Takahashi Hori. In addidion to the step-by-step instructions, this book includes various information, such as history of sushi, sushi etiquette, and so on.
2. Easy Sushi
By Emi Kazuko. If you have never cooked sushi before, start from this book.3. The Book of Sushi
By Yuzuru Tachibana and Kinjiro Omae. Includes history of sushi, how to eat sushi, and lots more.4. The Sushi Cookbook : A Step-by-Step Guide to This Popular Japanese Cui
By Katsuji Yamamoto and Roger Hicks. Includes nice step-by-step photos and information about equipment and ingredients.