Peter Dannenberg, Elmar Kulke
Routledge, 2015
Buku Teks
edited by Zacharoula Andreopoulou, Vagis Samathrakis, Soulla Louca, Maro Vlacopoulu
Igi Global, 2014
Buku Teks
Gilbert, Alan
University Press, 1989
Buku Teks
Ness, Gayl D.
University of California Press, 1967
Buku Teks
United Nations, 1983
Buku Teks