McArthur, Tom (Thomas Burns), author
Oxford University Press, 1983
Buku Teks
Swan, Michael, author
Cambridge University Press, 1993
Buku Teks
Buku Teks
Brown, E.H. Phelps, author
Sir Isaac Pitman & Sons, 1953
Buku Teks
French, F. G., author
Oxford University Press, 1951
Buku Teks