Dyfyniad APA

(2011). Annual editions: Psychology. 2010/2011. Guilford, CT: McGraw-Hill.

Dyfyniad Arddull Chicago

Annual Editions: Psychology. 2010/2011. Guilford, CT: McGraw-Hill, 2011.

Dyfyniad MLA

Annual Editions: Psychology. 2010/2011. Guilford, CT: McGraw-Hill, 2011.

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