Dyfyniad APA
(1986). Urlich's international periodicals directory: A classified guide to current periodicals, foreign and domestic 1986-1987 (25th ed.). Bowker.
Dyfyniad Arddull Chicago
Urlich's International Periodicals Directory: A Classified Guide to Current Periodicals, Foreign and Domestic 1986-1987. 25th ed. New York: Bowker, 1986.
Dyfyniad MLA
Urlich's International Periodicals Directory: A Classified Guide to Current Periodicals, Foreign and Domestic 1986-1987. 25th ed. Bowker, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.