Parish, Matthew, author
Edward Elgar, 2011
Buku Teks
Kramish, Arnold, author
Harper & Row, 1963
Buku Teks
edited by Jan Klabbers, Asa Wallendahl
Edward Elgar, 2011
Buku Teks
Hay, Peter
University of Illinois Press, 1966
Buku Teks
Bennett, A. LeRoy, author
Prentice-Hall, 1977
Buku Teks