1. Assessing the cost of pressure sores;McSweeney,1994
2. Twenty year anniversary by Joyce Black;National Pressure Ulcer Advisory Panel (NPUAP).,2006
3. Prevention is cheaper than cure;Waterlow,1988
4. Opflgende prvalensundersgelse for tryksportryksr p Bispebjerg Hospital;Bermark,2006
5. Pressure sore prevalence;Thoroddsen,1999