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Oxford University Press, 1993
Buku Referensi
Porter, Roy, 1946-2002
Cambridge University Press, 1996
Buku Referensi
edited by Jonathan Bate and Russell Jackson
Oxford University Press, 1996
Buku Teks
Taylor, F. Sherwood, author
Frederick A. Praeger, , 1955
Buku Teks
edited by Michael Hoskin
Cambridge University Press, 1997
Buku Referensi