Sordillo, D. A. (1978). The programmer's ANSI COBOL reference manual. Prentice-Hall.
Chicago-čujuhus (17. p.)Sordillo, Donald A. The Programmer's ANSI COBOL Reference Manual. Englewood Cliffs, N.J.: Prentice-Hall, 1978.
MLA-čujuhus (9. p.)Sordillo, Donald A. The Programmer's ANSI COBOL Reference Manual. Prentice-Hall, 1978.
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