ARNOLD,Robert R. (1978). Modern Data Processing Robert R Arnold, Harold C Hill, Dan Aylmer V.nichols. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)ARNOLD,Robert R. Modern Data Processing Robert R Arnold, Harold C Hill, Dan Aylmer V.nichols. John Wiley & Sons, 1978.
Lua MLA (8ú heag.)ARNOLD,Robert R. Modern Data Processing Robert R Arnold, Harold C Hill, Dan Aylmer V.nichols. John Wiley & Sons, 1978.
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