Conway, Richard
An Introduction to programming: a structured approach using PL/I and PL/C
Winthrop Publishers, 1973
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Hughes, Joan K.
PL/ I structured programming
John Wiley & Sons, 1979
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Davidson, Melvin
PL/I programming with PL/C
Hougtton-Mifflin, 1973
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Tucker, Allen B.
Programming languages
McGraw-Hill, 1986
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Tucker, Allen B.
Programming languages
McGraw-Hill, 1977
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