International Labour office. Penelitian kerja dan penelitian Metode. Jakarta: 1969.
Dyfyniad Arddull ChicagoInternational Labour office. Penelitian Kerja Dan Penelitian Metode. Jakarta: 1969.
Dyfyniad MLAInternational Labour office. Penelitian Kerja Dan Penelitian Metode. Jakarta: 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.