edited by Vincenzo Ruggiero, Nigel South, Ian R. Taylor
Routledge , 1998.
Buku Teks
Freymond, Jacques
Frederick A. Preager, 1964
Buku Teks
Stavrianos, Leften Stavros
Prentice-Hall, 1982
Buku Teks
Alenka Selih
Springer, 2012
eBooks
Hayes, Carlton J.
Macmillan, 1956
Buku Teks