Prakash, Naveen and Sharma, Y. K. "An integrated data base language" pp82-96

[SIGPLAN] (1979) SIGPLAN Notices 14(07) July 1979  

Languages mentioned ALPHA {1971} Data-query language based on relational calculus HYPOL {1979} Integrated DB language JCL {1971} Job Control Language Pascal (Jensen and Wirth) {1975} 1975 revision of Pascal