MODELL, M. E. (1992). Data Analysis Data Modeling And Classification Martin E. Modell. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)MODELL, Martin E. Data Analysis Data Modeling And Classification Martin E. Modell. McGraw-Hill, 1992.
Lua MLA (8ú heag.)MODELL, Martin E. Data Analysis Data Modeling And Classification Martin E. Modell. McGraw-Hill, 1992.
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