Various. Scientific American Supplement, No. 446, July 19, 1884.
Chicago-čujuhus (17. p.)Various. Scientific American Supplement, No. 446, July 19, 1884.
MLA-čujuhus (9. p.)Various. Scientific American Supplement, No. 446, July 19, 1884.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.