Dyfyniad APA

(2008).  Occupational outlook handbook.  U.S. Dept. of Labor, Bureau of Labor Statistics.

Dyfyniad Arddull Chicago

 Occupational Outlook Handbook.  U.S. Dept. of Labor, Bureau of Labor Statistics, 2008.

Dyfyniad MLA

 Occupational Outlook Handbook.  U.S. Dept. of Labor, Bureau of Labor Statistics, 2008.

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