Dyfyniad APA

 Locker, K. O. (2007).  Business communication: Building critical skills.  McGraw-Hill Ryerson.

Dyfyniad Arddull Chicago

 Locker, Kitty O.  Business Communication: Building Critical Skills.  McGraw-Hill Ryerson, 2007.

Dyfyniad MLA

 Locker, Kitty O.  Business Communication: Building Critical Skills.  McGraw-Hill Ryerson, 2007.

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