Bartlett, John, author
Routledge and Kegan Paul, 1955
Buku Referensi
Fleming H Revel Co., 1947
Buku Teks
Cohen, J.M. (John Michael), 1903-1989, author
Allen Lane, 1980
Buku Referensi
Jarman, Colin, author
Guinness Publishing, 1991
Buku Referensi
Bloomsbury, 1990
Buku Referensi