Rizkalla, R. R., & Afaf Fouad Nakhla. (1982). Special Problems in Linear Programing. Ain Shams University.
Lua i Stíl Chicago (17ú heag.)Rizkalla, Rafat Riad, agus Afaf Fouad Nakhla. Special Problems in Linear Programing. Cairo: Ain Shams University, 1982.
Lua MLA (9ú heag.)Rizkalla, Rafat Riad, agus Afaf Fouad Nakhla. Special Problems in Linear Programing. Ain Shams University, 1982.
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