Gennart, P. E.; Haentjens, R.; Horne, R.; Lathuy, L.; Mathieu, J. "Portability of an ALGOL 68 compiler"

van der Poel, Maarsen (eds) (1974) Machine Oriented Higher Level Languages (van der Poel, Maarsen, editors) North Holland 1974  

Languages mentioned ALGOL 68 {1968} 3rd generation ALGOL POFAC {1974} STAGE2 {1970}