APA-čujuhus (7. p.)
Ingenious Mechanisms for designers and inventors.
Chicago-čujuhus (17. p.)
Ingenious Mechanisms for Designers and Inventors.
MLA-čujuhus (9. p.)
Ingenious Mechanisms for Designers and Inventors.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.