Clean ABAP : A Style Guide for Developers - Klaus Haeuptle; Florian Hoffmann; Rodrigo Jordão; Michel Martin; Anagha Ravinarayan; Kai Westerholz; Klaus Haeuptle; Florian Hoffmann; Rodrigo Jordão; Michel Martin; Anagha Ravinarayan; Kai Westerholz (Clean ABAP : A Style Guide for Developers, 2020)