APA-čujuhus (7. p.)
Davidson, G. (2014). North American tunneling: 2014 proceedings. Society for Mining Metallurgy and Exploration.
Chicago-čujuhus (17. p.)
Davidson, Gregg. North American Tunneling: 2014 Proceedings. Colorado: Society for Mining Metallurgy and Exploration, 2014.
MLA-čujuhus (9. p.)
Davidson, Gregg. North American Tunneling: 2014 Proceedings. Society for Mining Metallurgy and Exploration, 2014.
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