Dyfyniad APA

World Health organization. (1999). Biphenyl. World Health organization.

Dyfyniad Arddull Chicago

World Health organization. Biphenyl. Geneva: World Health organization, 1999.

Dyfyniad MLA

World Health organization. Biphenyl. World Health organization, 1999.

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