Gottner, H. R. (1968). On The Planning Method "PERT" and its Application in the GDR. The Institute of National Planning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGottner, Habil Reinhard. On The Planning Method "PERT" and Its Application in the GDR. Cairo: The Institute of National Planning, 1968.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGottner, Habil Reinhard. On The Planning Method "PERT" and Its Application in the GDR. The Institute of National Planning, 1968.
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