elshafei, a. (1969). an introduction to simulation. National Planning Institute.
Lua i Stíl Chicago (17ú heag.)elshafei, alwalid. An Introduction to Simulation. cairo: National Planning Institute, 1969.
Lua MLA (9ú heag.)elshafei, alwalid. An Introduction to Simulation. National Planning Institute, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.