NORMAN, R. J. (1996). Object-oriented systems analysis and design. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)NORMAN, Ronald J. Object-oriented Systems Analysis and Design. London: Prentice Hall, 1996.
Lua MLA (9ú heag.)NORMAN, Ronald J. Object-oriented Systems Analysis and Design. Prentice Hall, 1996.
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