O'BRIEN, J. A. (1986). Computers And Information Processing With Sofware Tutorial And Basic James A. O'brien. Richard D. Irwin Inc.
Lua i Stíl Chicago (17ú heag.)O'BRIEN, James A. Computers And Information Processing With Sofware Tutorial And Basic James A. O'brien. Richard D. Irwin Inc, 1986.
Lua MLA (8ú heag.)O'BRIEN, James A. Computers And Information Processing With Sofware Tutorial And Basic James A. O'brien. Richard D. Irwin Inc, 1986.
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