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Dyfyniad Arddull ChicagoUniversity, St. Louis. Universitas - Issue 26.1 (Fall 1999). Saint Louis University Libraries Digitization Center, 1999.
Dyfyniad MLAUniversity, St. Louis. Universitas - Issue 26.1 (Fall 1999). Saint Louis University Libraries Digitization Center, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.