Knauthe, E. (1968). Experiences Concerned with Preparation and Carrying-out of Investments. The Institute of National Planning.
Chicago-čujuhus (17. p.)Knauthe, Erhart. Experiences Concerned with Preparation and Carrying-out of Investments. Cairo: The Institute of National Planning, 1968.
MLA-čujuhus (9. p.)Knauthe, Erhart. Experiences Concerned with Preparation and Carrying-out of Investments. The Institute of National Planning, 1968.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.