Katz, W. A. (2002). Introduction to reference work. Boston: McGraw-Hill.
Dyfyniad Arddull ChicagoKatz, William A. Introduction to Reference Work. Boston: McGraw-Hill, 2002.
Dyfyniad MLAKatz, William A. Introduction to Reference Work. Boston: McGraw-Hill, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.