Winnington, Alan
Seven Seas, 1962
Buku Teks
Palmer, Joel
Ann Arbor University Microfilms 1966
Buku Teks
Horowitz Publications, 1961
Buku Teks
Christian Baumgartner , Martin Uitz, Karl Krainer, Peter Hasslacher
The Federal Press Service, 2002
Buku Referensi
Winnington, Alan
Seven Seas Publishers, 1962
Buku Teks