APA-viite (7. p.)
Davidson, G. (2014). North American tunneling: 2014 proceedings. Society for Mining Metallurgy and Exploration.
Chicago-viite (17. p.)
Davidson, Gregg. North American Tunneling: 2014 Proceedings. Colorado: Society for Mining Metallurgy and Exploration, 2014.
MLA-viite (9. p.)
Davidson, Gregg. North American Tunneling: 2014 Proceedings. Society for Mining Metallurgy and Exploration, 2014.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.