Gottner, H. R. (1968). On The Planning Method "PERT" and its Application in the GDR. The Institute of National Planning.
Tohutoru Kātū Chicago (17th ed.)Gottner, Habil Reinhard. On The Planning Method "PERT" and Its Application in the GDR. Cairo: The Institute of National Planning, 1968.
Tohutoro MLA (9th ed.)Gottner, Habil Reinhard. On The Planning Method "PERT" and Its Application in the GDR. The Institute of National Planning, 1968.
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