TY - BOOK AU - Greenwood, Ken TI - Sams teach yourself ABAP/4 in 21 days SN - 8176351628 U1 - 650.028553769 GRE CY - New Delhi PB - SAMS Tech media publications KW - Sams teach yourself ABAP/4 in 21 days KW - Ken Greenwood KW - ABAP/4 (Computer program language) KW - R/3 (Computer system) KW - Computer Science ER -