Porter, Roy, 1946-2002
Cambridge University Press, 1996
Buku Referensi
edited by Jonathan Bate and Russell Jackson
Oxford University Press, 1996
Buku Teks
edited by Peter Hunt
Oxford University Press , 1995
Buku Teks
edited by Peter Hunt
Oxford University Press, 1995
Buku Referensi
Taylor, F. Sherwood, author
Frederick A. Praeger, , 1955
Buku Teks