edited by Derek P. Atherton, Pierre Borne
Pergamon Press, 1992
Buku Referensi
Encyclopaedia Britannica, 2002
Buku Referensi
Routledge, 2000
Buku Referensi
Ensminger, Audrey; Ensminger, M.E.; Konlande, James E.; Robson, John R.K.
CRC Press, 1994
Buku Referensi
Hutchinson, 1959
Buku Referensi