Routledge-Cavendish , 2007
Buku Teks
Strassfeld, Michael, author
Harper and Row, 1985
Buku Referensi
Leslie, Donald Daniel
E.J. Brill , 1972
Buku Teks
Schwarz, Karl, author
Philosophical Library, 1949
Buku Teks
Stratton, Jon
Routledge, 2000
Buku Teks