(2012). 2009/2010 Industry profile: Mining and quarrying. Labstat Updates.
Dyfyniad Arddull Chicago"2009/2010 Industry Profile: Mining and Quarrying." Labstat Updates 2012.
Dyfyniad MLA"2009/2010 Industry Profile: Mining and Quarrying." Labstat Updates, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.