Dyfyniad APA
ebrary, Inc, Werner, E. D., & Friedman, H. P. (2010). Landslides: Causes, types and effects. Nova Science Publishers.
Dyfyniad Arddull Chicago
ebrary, Inc, Ernest D. Werner, and Hugh P. Friedman. Landslides: Causes, Types and Effects. New York: Nova Science Publishers, 2010.
Dyfyniad MLA
ebrary, Inc, et al. Landslides: Causes, Types and Effects. Nova Science Publishers, 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.