edited by Rudolf Walther with the cooperation of Martin Strauss
Pergamon Press, 1976
Buku Referensi
de Vries, Louis, author
McGraw-Hill, 1959
Buku Referensi
Routledge, 1997
Buku Referensi
Urwin, Kenneth, author
Langensheidt, 1988
Buku Referensi
editor, Rudolf Walther
Pergamon Press, 1972
Buku Referensi