Dyfyniad APA

HILL, J. W. (1984). Chemistry for changing time.-- 4th ed. Macmillan Publishing.

Dyfyniad Arddull Chicago

HILL, John W. Chemistry for Changing Time.-- 4th Ed. New York: Macmillan Publishing, 1984.

Dyfyniad MLA

HILL, John W. Chemistry for Changing Time.-- 4th Ed. Macmillan Publishing, 1984.

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