RIBERA, G. (1979). Machine calculation for business and personal use.--Ed.2. Holden-Day.
Lua i Stíl Chicago (17ú heag.)RIBERA, Gil. Machine Calculation for Business and Personal Use.--Ed.2. London: Holden-Day, 1979.
Lua MLA (9ú heag.)RIBERA, Gil. Machine Calculation for Business and Personal Use.--Ed.2. Holden-Day, 1979.
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