Palmer, Alan, author
Penguin Books, 1981
Buku Referensi
general editor, David W. Pearce
Macmillan Press, 1992
Buku Referensi
Leifer, Michael, author
Routledge, 1995
Buku Referensi
Leifer, Michael, author
Routledge, 1996
Buku Referensi
Partridge, Eric, 1894-1979, author
Macmillan, 1959
Buku Referensi