Dyfyniad APA
Williams, J. (2008). Engineering tribology. Cambridge University Press.
Dyfyniad Arddull Chicago
Williams, John. Engineering Tribology. New York: Cambridge University Press, 2008.
Dyfyniad MLA
Williams, John. Engineering Tribology. Cambridge University Press, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.