Dyfyniad APA

MCGRAW-HILL. (1992). Mcgraw-hill encyclopedia of science and technology 8: GEO-HYS. McGraw-Hill.

Dyfyniad Arddull Chicago

MCGRAW-HILL. Mcgraw-hill Encyclopedia of Science and Technology 8: GEO-HYS. New York: McGraw-Hill, 1992.

Dyfyniad MLA

MCGRAW-HILL. Mcgraw-hill Encyclopedia of Science and Technology 8: GEO-HYS. McGraw-Hill, 1992.

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