International Associational of university, 1993
Buku Referensi
edited by Severin Daum
Charles University, 2003
Buku Teks
edited by R.W. Sarsby, T. Meggyes
CRC Press, 2010
Buku Teks
Aleksandar Subic, Jorg Wellnitz, Martin Leary, Lucien koopmans, editor
[, Springer], 2012
eBooks
Graff, Gerald
W. W. Norton, 1992
Buku Teks