Conway, Richard
An Introduction to programming: a structured approach using PL/I and PL/C
Winthrop Publishers, 1973
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Conway, Richard
An introduction to programming: a structured approach using PL/1 and PL/C-7
Massachusetts Winthrop Publishers, 1975
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Edwards, Leonard E.
PL/I for business applications
Reston Publishing, 1973
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Katzan, Harry, Jr.
A PL/I approach to programming languages
Auerbach, 1972
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Brown, Martin C.
Perl : programmer's reference
Osborne/McGraw-Hill, 1999
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