Dyfyniad APA
ebrary, Inc, & Cateland, R. P. (2009). Energy efficiency solutions. Nova Science Publishers.
Dyfyniad Arddull Chicago
ebrary, Inc, and Richard P. Cateland. Energy Efficiency Solutions. New York: Nova Science Publishers, 2009.
Dyfyniad MLA
ebrary, Inc, and Richard P. Cateland. Energy Efficiency Solutions. Nova Science Publishers, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.