Dyfyniad APA

Kathryn Whyman. (1987). Resources today: Plastics. New York: Gloucester Press.

Dyfyniad Arddull Chicago

Kathryn Whyman. Resources Today: Plastics. New York: Gloucester Press, 1987.

Dyfyniad MLA

Kathryn Whyman. Resources Today: Plastics. New York: Gloucester Press, 1987.

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