Various. Scientific American Supplement, No. 595, May 28, 1887.
Chicago-čujuhus (17. p.)Various. Scientific American Supplement, No. 595, May 28, 1887.
MLA-čujuhus (9. p.)Various. Scientific American Supplement, No. 595, May 28, 1887.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.