Head First EJB: Passing the Sun Certified Business Component Developer Exam

OCA/OCP Java SE 7 Programmer I & II Study Guide (Exams 1Z0-803 & 1Z0-804)

OCP Java SE 6 Programmer Practice Exams (Exam 310-065)

SCJP Sun Certified Programmer for Java 6 Study Guide: Exam 310-065

OCA Java SE 8 Programmer I Exam Guide (Exams 1Z0-808)

Head First Java: Edition 3

OCP Java SE 8 Programmer II Exam Guide (Exam 1Z0-809): Edition 7