Lutz, R. R. (1949). Graphic presentation simplified. Funk & Wagnalls.
Dyfyniad Arddull ChicagoLutz, Rufus Rolla. Graphic Presentation Simplified. New York: Funk & Wagnalls, 1949.
Dyfyniad MLALutz, Rufus Rolla. Graphic Presentation Simplified. Funk & Wagnalls, 1949.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.