The ABAP Quick Reference, Horst Keller,

New ABAP Language Features in ABAP 7. 4 And 7. 5 by Mark Anderson (2019, ...

The Official ABAP Reference, Keller, Horst, 9781592290390

ABAP/4: A Guide to the Language of the R/3 System (SAP),Bernard

The Official ABAP Reference by Horst Keller; Joachim Jacobitz

The ABAP Quick Reference by Horst Keller

Sap R/3 Abap/4: Command Reference, Barrett, Dennis, 9780789714169