Hughes, Joan K.
PL/ I structured programming
John Wiley & Sons, 1979
 Buku Teks
Hume, J.N.P.
Structured programming using PL/1 and SP/K
Prentice-Hall, 1975
 Buku Teks
Scheid, Francis
Theory and problems of computers and programming
McGraw-Hill, 1983
 Buku Teks
Conway, Richard
An introduction to programming: a structured approach using PL/1 and PL/C-7
Massachusetts Winthrop Publishers, 1975
 Buku Teks SO
Barnes, J.G.P. (John Gilbert Presslie)
Programming in Ada
Addison-Wesley, 1981
 Buku Teks