Ulrichsen, Kristian, author
Palgrave Macmillan, 2016
Buku Teks
edited by David Zweig and Chen Zhimin
Routledge, 2007
Buku Teks
Oatley, Thomas, author
Pearson, 2012
Buku Teks
Smith, Roy H., author
Routledge, 2017
Buku Teks
Balaam, David N., 1950-, author
Pearson Education, 2014
Buku Teks