Worldwide Energy. Worldwide Videotex.
Chicago-čujuhus (17. p.)Worldwide Energy. Worldwide Videotex.
MLA-čujuhus (9. p.)Worldwide Energy. Worldwide Videotex.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
APA-čujuhus (7. p.)