Stokes, Adrian V.
Wildwood House, 1986
Buku Referensi
edited by Derek P. Atherton, Pierre Borne
Pergamon Press, 1992
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Encyclopaedia Britannica, 2002
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Routledge, 2000
Buku Referensi
Ensminger, Audrey; Ensminger, M.E.; Konlande, James E.; Robson, John R.K.
CRC Press, 1994
Buku Referensi