Dyfyniad APA
Katz, W. A. (1997). Introduction to reference work (7th ed.). McGraw-Hill.
Dyfyniad Arddull Chicago
Katz, William A. Introduction to Reference Work. 7th ed. New York: McGraw-Hill, 1997.
Dyfyniad MLA
Katz, William A. Introduction to Reference Work. 7th ed. McGraw-Hill, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.