Dix, K. (1988). What's a coal miner to do?: The mechanization of coal mining. University of Pittsburgh Press.
Chicago-referens (17:e uppl.)Dix, Keith. What's a Coal Miner to Do?: The Mechanization of Coal Mining. Pittsburgh, Pa.: University of Pittsburgh Press, 1988.
MLA-referens (9:e uppl.)Dix, Keith. What's a Coal Miner to Do?: The Mechanization of Coal Mining. University of Pittsburgh Press, 1988.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.