Pike, Dauglas
Cambridge at the University Press, 1966
Buku Teks
Pike, Douglas, 1908-1974, author
Cambridge University Press, 1970
Buku Teks
Crawford, R. M.
Hutchinson's University Library, 1955
Buku Teks
Crawford, R.M., author
Hutchinson University Library, 1952.
Buku Teks
Shaw, A.G.L. (Alan George Lewers), author
Faber and Faber, 1955
Buku Teks