Gaya APA

Christoph, M, G. (2011). Geotrends-The Progress of Geological and Geotechnical Engineering in Colorado at the cusp of a new decade . : ASCE.

Gaya MLA

Christoph, M., Goss,. "Geotrends-The Progress of Geological and Geotechnical Engineering in Colorado at the cusp of a new decade". : ASCE, 2011. Filmstrip.