Lua APA (7ú heag.)

Elshafei, A. (1969). General Purpose Systems Simulator (GPSS). The Institute of National Planning.

Lua i Stíl Chicago (17ú heag.)

Elshafei, Alwalid. General Purpose Systems Simulator (GPSS). Cairo: The Institute of National Planning, 1969.

Lua MLA (9ú heag.)

Elshafei, Alwalid. General Purpose Systems Simulator (GPSS). The Institute of National Planning, 1969.

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