Dyfyniad APA

Frailey L.E & Mamchak Susan. (1993). Hanbook of Business Letters (3rd Edition.). Super Book House.

Dyfyniad Arddull Chicago

Frailey L.E and Mamchak Susan. Hanbook of Business Letters. 3rd Edition. Bombay: Super Book House, 1993.

Dyfyniad MLA

Frailey L.E and Mamchak Susan. Hanbook of Business Letters. 3rd Edition. Super Book House, 1993.

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