Elshafei, A. (1969). General Purpose Systems Simulator (GPSS). The Institute of National Planning.
Citação do estilo Chicago (17ª ed.)Elshafei, Alwalid. General Purpose Systems Simulator (GPSS). Cairo: The Institute of National Planning, 1969.
Citação MLA (9ª ed.)Elshafei, Alwalid. General Purpose Systems Simulator (GPSS). The Institute of National Planning, 1969.