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Dyfyniad Arddull ChicagoAmerican Academy of Pediatrics. Pediatrics, Official Journal of the American Acaddemy of Pediatrics Nº1. Barcelona: Doyma, 2008.
Dyfyniad MLAAmerican Academy of Pediatrics. Pediatrics, Official Journal of the American Acaddemy of Pediatrics Nº1. Doyma, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.