(1945). Operating instructions for Model 12 modulator / A.C. Donovan.
Chicago-čujuhus (17. p.)Operating Instructions for Model 12 Modulator / A.C. Donovan. 1945.
MLA-čujuhus (9. p.)Operating Instructions for Model 12 Modulator / A.C. Donovan. 1945.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.