Elshafei, A. (1968). Product Performance Models PPM. The Institute of National Planning.
Chicagoスタイル(17版)引用形式Elshafei, Alwalid. Product Performance Models PPM. Cairo: The Institute of National Planning, 1968.
MLA(9版)引用形式Elshafei, Alwalid. Product Performance Models PPM. The Institute of National Planning, 1968.
警告: この引用は必ずしも正確ではありません.