ebrary, Inc, & Edgerton, W. W. (2008). Recommended contract practices for underground construction. Society for Mining, Metallurgy, and Exploration.
Chicago-referens (17:e uppl.)ebrary, Inc, och William W. Edgerton. Recommended Contract Practices for Underground Construction. Littleton, Colo.: Society for Mining, Metallurgy, and Exploration, 2008.
MLA-referens (9:e uppl.)ebrary, Inc, och William W. Edgerton. Recommended Contract Practices for Underground Construction. Society for Mining, Metallurgy, and Exploration, 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.