Gosden, John A.; Gay, Roger E.; Jones, John L.; Merner, Jack N. Shaw, Christopher J. "Report of a visit to discuss common programming languages in Czechoslavakia and Poland, 1963" pp660-661

[ACM] (1963) [ACM] CACM 6(11) (Nov 1963)  

Languages mentioned ALGOL/ZAM {1967} Algol for the Polish ZAM computer APRIL {1969} Programming language for the ARGUS 5000 SAKO {1960} Polish Automatic Coder