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Dyfyniad Arddull ChicagoHawton, K., H. Bergen, S. Mahadevan, D. Casey, and S. Simkin. Suicide and Deliberate Self-harm in Oxford University Students over a 30-year Period. 2012.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.