Boerner, Peter
Hamburg Rowohlt Taschenbuch 1964
Buku Teks
Friedmann, Wolfgang
Stevens & Sons Limited, 1953
Buku Klasik
Blais, Marie-Claire, 1939-, author
McClelland and Stewart, 1979
Buku Teks
Elkins, William R., author
McGraw-Hill, 1982
Buku Teks
edited by Clement Semmler and Derek Whitelock
F.W. Cheshire, 1966
Buku Teks