Kahn, James R., author
Thomson, 2005
Buku Teks
Pearce, D. W. (David William), 1941-, author
Harvester Wheatsheaf, 1990
Buku Teks
Santos, Filipe Duarte, author
Springer, 2012
eBooks
edited by Hubert Heinelt, Randall Smith.
Routledge, 2019
Buku Teks
Elisa Morgera, Kati Kulovesi
Edward Elgar, 2016
Buku Teks