Litecky, Charles R.
Structured COBOL: a step by step approach
McGraw-Hill , 1987
Buku Teks
Smith, Marilyn Z.
Standard Cobol: a problem-solving approach
Houghton-Mifflin, 1974
Buku Teks
Litecky, Charles R.
Structured Cobol: a step by step approach
McGraw-Hill, 1987
Buku Teks
Katzan, Harry, Jr.
A PL/I approach to programming languages
Auerbach, 1972
Buku Teks
Welland, Ray
Methodical programming in Cobol-85
Pitman, 1993
Buku Teks