Academy Editions, 1990
Buku Referensi
Powell, Robert, author
Akimedia, 2001
Buku Teks
edited by Paul Dragos Aligica, Paul Lewis, Virgil H. Storr
Emerald, 2017
eBooks
Christian Baumgartner , Martin Uitz, Karl Krainer, Peter Hasslacher
The Federal Press Service, 2002
Buku Referensi
edited by Pippo Ciorra and Marco D`Annuntiis
Skira, 2000
Buku Teks