Gregg, Pauline, author
George G. Harrap, 1952
Buku Teks
Gregg, Pauline, author
George G. Harrap, 1967
Buku Teks
A.G. Champion...[et al.]
Baltimore, Md., USA: Arnold, 1987
Buku Teks
Clapham, John, Sir, author
The Cambridge University Press, 1949
Buku Teks
edited by F. M. L. Thomson
Cambridge University Press, 1990
Buku Teks