Dyfyniad APA

States), N. F. P. A. (. (1989). National Fire Protection Association 1989 directory. Quincy, MA : NFPA.

Dyfyniad Arddull Chicago

States), National Fire Protection Association (United. National Fire Protection Association 1989 Directory. Quincy, MA : NFPA, 1989.

Dyfyniad MLA

States), National Fire Protection Association (United. National Fire Protection Association 1989 Directory. Quincy, MA : NFPA, 1989.

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