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Dyfyniad Arddull ChicagoLiss, Per-Erik. Health Care Need: Meaning and Measurement. Aldershot ; Brookfield, USA: Avebury, 1993.
Dyfyniad MLALiss, Per-Erik. Health Care Need: Meaning and Measurement. Avebury, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.