Core Servlets and JavaServer Pages
By Marty Hall, Practical guide to using the Java Platform for Web-enabled applications and dynamic Web sites

JavaServer Pages Fast and Easy Web Development
By Aneesha Bakharia, "My book offers the simplest way to learn JSP. It also assumes no prior knowledge of Java." --Aneesha Bakharia

JavaServer Pages From Scratch
By Maneesh Sahu, Teaches beginning users about the many techniques involved in JavaServer Pages by building an online auction house with an events calendar.

The Esperanto Group's Web JSP Book

The Java Language Specification
By James Gosling, Bill Joy, Guy Steele

The Java Virtual Machine Specification
By Tim Lindholm, Frank Yellin

Web Development with JavaServer Pages