Dyfyniad APA

Bull George. (1977). Directors Hand Book (2nd ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Bull George. Directors Hand Book. 2nd ed. London: McGraw-Hill, 1977.

Dyfyniad MLA

Bull George. Directors Hand Book. 2nd ed. McGraw-Hill, 1977.

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