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| 1. |
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ProgramLive CD, Stand Alone version
David Gries, Paul Gries, Petra Hall
John Wiley & Sons, Storbritannien, 2001.
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| 2. |
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The Programlive Companion
David Gries, Paul Gries, Petra Hall
John Wiley & Sons Ltd, Storbritannien, 2001.
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| 3. |
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History of the World's Lost Cities Including Troy, Babylon, Tenochtitlan, Machu Picchu, Petra and More
Abe Hall
Häftad. Webster's Digital Services, 2011.
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| 4. |
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Nineteenth-Century European Art (Trade)
Petra Chu
Inbunden. Prentice Hall, USA, 2006.
|
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| 5. |
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Nineteenth-Century European Art Trade
Petra Ten-Doesschate Chu
Inbunden. Prentice Hall, USA, 2003.
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| 6. |
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Nineteenth Century Art (Trade Version)
Petra Ten-Doesschate Chu
Inbunden. Prentice Hall, USA, 2002.
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