Advanced ABAP Programming for SAP By Gareth M. De Bruyn	Introduction to ABAP/4 Programming for SAP, Revised and Expanded Edition By Gareth M. De Bruyn, Robert Lyfareff	SAP R/3 Data Integration Techniques using ABAP/4 and Visual Basic By Stephen J. Katonka	ABAP/4, Second Edition: Programming the SAP(R) R/3(R) System (2nd Edition) By Bernd Matzke
Software Development for Sap R/3: Data Dictionary, Abap/4, Interfaces By Ulrich Mende	Sap Abap Command Reference By Dennis Barrett	Writing SAP ABAP/4 Programs By Ted Hoffman, Theodore Hoffman	Developing Sap's R/3 Applications With Abap/4 By Rudiger Kretschmer
ABAP Objects: Introduction to Programming SAP Applications with CDROM By Horst Keller, Sascha Kruger	Instant Access: SAP Developer's Reference for ABAP By Consultants Network Inc.	SAP Blue Book, A Concise Business Guide to the World of SAP By Michael Doane	Administering SAP R/3: The Production and Planning Module (Que-Consumer-Other) By Asap World Consultancy, ASAP World Consulting, Randy Haubner