Out of the shadows : Four videos in which Terry Pratchett reveals what it was like to be diagnosed with posterior cortical atrophy (PCA), a rare variant of Alzheimer's disease.
"29 September 2007 Live Webcast". مؤرشف من الأصل(audio) في 2008-03-07. Terry Pratchett speaks and answers questions at the 2007 National Book Festival in Washington DC