Litecky, Charles R.
Structured Cobol: a step by step approach
McGraw-Hill, 1987
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Johnson, David L., 1935-
Writing Structured COBOL
Addison-Wesley, 1986
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Graver, Robert T.
Structured methods trough COBOL
Prentice-Hall, 1983
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Stern, Nancy B.
Structured COBOL programming
Wiley, 1994
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Newcomer, Lawrence R.
Schaum's outline of theory and problems of programming with structured Cobol
McGraw-Hill, 1984
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