TY  - BOOK
AU  - Hughes, Joan K 
TI  - PL/I structured programming 
SN  - 0-471-83746-6
PY  - 1680///39
CY  - New York: 
PB  - John Wiley & Sons, 
KW  - Top-down structured programming
KW  - Data manipulation
KW  - I/O structure
ER  -