1. CODASYL CODASYL Database Task Group April 71 Report available from ACM NYC. CODASYL CODASYL Database Task Group April 71 Report available from ACM NYC.
2. Gerritsen Rob Jim Riberio Richard Cotes and Ruth Zowader "Wand User's Guide " Decision Sciences Working Paper 76--01--03 Wharton School University of Pennsylvania 1976. Gerritsen Rob Jim Riberio Richard Cotes and Ruth Zowader "Wand User's Guide " Decision Sciences Working Paper 76--01--03 Wharton School University of Pennsylvania 1976.
3. Germano Frank Jr. Stephen Higgenbotham and Robert Agnew "DL/S -- A Student Use Data Base Management System " CIS-CUD-76-03 Department of Computer and Information Sciences Temple University Philadelphia 1977. Germano Frank Jr. Stephen Higgenbotham and Robert Agnew "DL/S -- A Student Use Data Base Management System " CIS-CUD-76-03 Department of Computer and Information Sciences Temple University Philadelphia 1977.