Peter Dannenberg, Elmar Kulke
Routledge, 2015
Buku Teks SO
edited by Philip M. Hauser, Daniel B. Suits and Naohiro Ogawa
National Institute for Research Advancement, 1985
Buku Teks SO
edited by Zacharoula Andreopoulou, Vagis Samathrakis, Soulla Louca, Maro Vlacopoulu
Igi Global, 2014
Buku Teks
Ness, Gayl D.
University of California Press, 1967
Buku Teks
Gilbert, Alan
University Press, 1989
Buku Teks SO