Vaucher, Jean G. "Simulation data structures using SIMULA 67" pp255-260

[Proceedings] (1971) The 5th Winter Simulation Conference 8-10 December 1971 Waldorf-Astoria Hotel, New York, NY  

Languages mentioned GPSSS {1972} Simula 67 with enhanced simulation capabilities SIMULA 67 {1967} Object-oriented simulation language