1. Wirth N. (1987) From Modula to Oberon and the programming language Oberon. Technical Report 82, Institut für Informatik, ETH, Zurich.
2. Weis P. , Aponte M.-V. , Laville A. , Mauny M. and Suárez A. (1990) The CAML reference manual. Research report 121, INRIA, Rocquencourt, September.
3. Extending Modula-2 to Build Large, Integrated Systems