Lua APA (7ú heag.)

SILVER GERALD A. (1981). DATA PROCESSING FOR BUSINESS (3RD.). HARCOURT.

Lua i Stíl Chicago (17ú heag.)

SILVER GERALD A. DATA PROCESSING FOR BUSINESS. 3RD. U.S.A: HARCOURT, 1981.

Lua MLA (9ú heag.)

SILVER GERALD A. DATA PROCESSING FOR BUSINESS. 3RD. HARCOURT, 1981.

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