SCBCD 5.0 is now available. For older version SCBCD 1.3, you will get many books like Head First EJB. For SCBCD 5.0, you will have to prepare from EJB 3.0 Specification and you could also refer Mikalai Zaikin's Notes (http://java.boot.by/scbcd5-guide)....
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SCJP 1.4 | SCWCD 1.4 | SCBCD 1.3 | SCEA Part I - Preparing..