(2012). 2009/2010 Industry profile: Mining and quarrying. Labstat Updates.
Cita Chicago (17th ed.)"2009/2010 Industry Profile: Mining and Quarrying." Labstat Updates 2012.
Cita MLA (9th ed.)"2009/2010 Industry Profile: Mining and Quarrying." Labstat Updates, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.