Dyfyniad APA

(1987). McGraw-Hill encyclopaedia of science and technology (6th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

McGraw-Hill Encyclopaedia of Science and Technology. 6th ed. New York: McGraw-Hill, 1987.

Dyfyniad MLA

McGraw-Hill Encyclopaedia of Science and Technology. 6th ed. McGraw-Hill, 1987.

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