(1981). Anti-polio vaccines donated for campaign. Bulletin Today.
Dyfyniad Arddull Chicago"Anti-polio Vaccines Donated for Campaign." Bulletin Today 1981.
Dyfyniad MLA"Anti-polio Vaccines Donated for Campaign." Bulletin Today, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.