ENRICK, N. L. Management Operations Research Norbert Lloyd Enrick. s.n.
Lua i Stíl Chicago (17ú heag.)ENRICK, Nobert Lloyd. Management Operations Research Norbert Lloyd Enrick. s.n.
Lua MLA (8ú heag.)ENRICK, Nobert Lloyd. Management Operations Research Norbert Lloyd Enrick. s.n.
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