editors, Helena Guasch, Antoni Ginebreda, Anita Geiszinger
Springer, 2012
eBooks
Rossabi, Morris, author
Wiley Balckwell, 2014
Buku Teks
Goldstein, Steven M., author
Polity Press, 2015
Buku Teks
Liu, James T.C.
Prentice-Hall, 1970
Buku Teks
Watson, William, author
Max Parrish, 1960
Buku Teks