Dyfyniad APA

Ross, M., & Williams, R. H. (1981). Our energy: Regaining control. McGraw-Hill.

Dyfyniad Arddull Chicago

Ross, Marc, and Robert H. Williams. Our Energy: Regaining Control. New York: McGraw-Hill, 1981.

Dyfyniad MLA

Ross, Marc, and Robert H. Williams. Our Energy: Regaining Control. McGraw-Hill, 1981.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.