Oberon-2
"From Modula-2 to Oberon" Wirth (1988)(PostScript形式を圧縮してある)
"The Programming Language Oberon" Wirth (1988)(PostScript形式を圧縮してある)
"Differences between Oberon and Oberon-2" Mössenböck and Wirth (1991)(PostScript形式を圧縮してある)
"The Programming Language Oberon-2" H. Mössenböck, N. Wirth, Institut für Computersysteme, ETH Zürich (ETHZ), January 1992
"Oberon Language Genealogy Tree" maintained at ETHZ
"What's New in Component Pascal" (Changes from Oberon-2 to CP), Pfister (2001)