MEDLEY, D. B., & MEDLEY, D. B. (1984). Programming Principles With Cobol I Don B. Medley And Ronald W. Eaves. South-Western Publishing.
Lua i Stíl Chicago (17ú heag.)MEDLEY, Don B., agus Don B. MEDLEY. Programming Principles With Cobol I Don B. Medley And Ronald W. Eaves. South-Western Publishing, 1984.
Lua MLA (8ú heag.)MEDLEY, Don B., agus Don B. MEDLEY. Programming Principles With Cobol I Don B. Medley And Ronald W. Eaves. South-Western Publishing, 1984.
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