singer, h. w. (1962). choic of technology. the institute of national planning.
Chicago-čujuhus (17. p.)singer, h. w. Choic of Technology. cairo: the institute of national planning, 1962.
MLA-čujuhus (9. p.)singer, h. w. Choic of Technology. the institute of national planning, 1962.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.