References Sadd, J. OpenEdge Development: Progress 4GL Handbook, Progress Software Corporation, , Kassabgi, G. Special Edition : Using Progress, Que Publishing, External links Official Website Progress 4GL Documentations OpenEdge Community OpenEdge Resource Hub What’s New in OpenEdge Getting started with progress-4gl Object-oriented programming languages Fourth-generation programming languages Data-centric programming languages Articles with example code Database-related software for Linux