Various; Youmans, W. J. Appletons' Popular Science Monthly, September 1899 Vol. LV, May to October, 1899.
Chicago-čujuhus (17. p.)Various; Youmans, William Jay. Appletons' Popular Science Monthly, September 1899 Vol. LV, May to October, 1899.
MLA-čujuhus (9. p.)Various; Youmans, William Jay. Appletons' Popular Science Monthly, September 1899 Vol. LV, May to October, 1899.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.