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Routledge, 1993
Buku Teks
Bray, R.G.A. de
J.M. Dent & Sons, 1951
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edited by Christopher M. Perrins and Alex L.A. Middleton
Grolier International, 1993
Buku Referensi
edited by P.V. Vidyasagar
Mittal Publications, 2000
Buku Referensi
general editor, G.H.R. Parkinson; associate editors, T.E. Burke, J.G. Cottingham, M.A. Proudham and J.E. Tiles
Routledge, 1988
Buku Referensi