Dyfyniad APA

Elshafei, A. (1968). Product Performance Models PPM. The Institute of National Planning.

Dyfyniad Arddull Chicago

Elshafei, Alwalid. Product Performance Models PPM. Cairo: The Institute of National Planning, 1968.

Dyfyniad MLA

Elshafei, Alwalid. Product Performance Models PPM. The Institute of National Planning, 1968.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.