Dyfyniad APA
Tillery, B. W. (2014). Physical science (10th ed.). McGraw-Hill Companies, Inc.
Dyfyniad Arddull Chicago
Tillery, Bill W. Physical Science. 10th ed. New York, NY: McGraw-Hill Companies, Inc, 2014.
Dyfyniad MLA
Tillery, Bill W. Physical Science. 10th ed. McGraw-Hill Companies, Inc, 2014.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.