(1977). The economics of new educational media: Present status of research and trends. Unesco.
Chicago-čujuhus (17. p.)The Economics of New Educational Media: Present Status of Research and Trends. London: Unesco, 1977.
MLA-čujuhus (9. p.)The Economics of New Educational Media: Present Status of Research and Trends. Unesco, 1977.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.