Dyfyniad APA

JAY Silverman, & Michael Ryan. (2009). Rules of Thumb. New York: David S. Patterson.

Dyfyniad Arddull Chicago

JAY Silverman, and Michael Ryan. Rules of Thumb. New York: David S. Patterson, 2009.

Dyfyniad MLA

JAY Silverman, and Michael Ryan. Rules of Thumb. New York: David S. Patterson, 2009.

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