Dyfyniad APA

Foundation Center. (1987). National data book (11th ed.). Foundation Center.

Dyfyniad Arddull Chicago

Foundation Center. National Data Book. 11th ed. New York: Foundation Center, 1987.

Dyfyniad MLA

Foundation Center. National Data Book. 11th ed. Foundation Center, 1987.

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