Davis, W. S. (1978). Business data processing. Addison-Wesley Pub. Co..
Lua i Stíl Chicago (17ú heag.)Davis, William S. Business Data Processing. Reading, Mass.: Addison-Wesley Pub. Co., 1978.
Lua MLA (9ú heag.)Davis, William S. Business Data Processing. Addison-Wesley Pub. Co., 1978.
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