Buka i-PDF yesethulo sikaDkt Retzler sika-PowerPoint
UDkt. Retzler unikeza ulwazi oluthe xaxa mayelana nezimbangela ezikhona, kanye nokwelapha, ukungasebenzi komzimba kubantu.
Ukukhubazeka Ngokocansi Kwabesilisa: Izimbangela, Ukuxilongwa, Nezinketho Zokwelapha. UKathryn Retzler, ND (2018)
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