Dyfyniad APA

Various. Scientific American Supplement, No. 433, April 19, 1884.

Dyfyniad Arddull Chicago

Various. Scientific American Supplement, No. 433, April 19, 1884.

Dyfyniad MLA

Various. Scientific American Supplement, No. 433, April 19, 1884.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.