Mager, N. H., author
Prentice-Hall, 1975
Buku Referensi
Fowler, H. W. (Henry Watson), 1858-1933
Oxford University Press, 1983
Buku Referensi
Partridge, Eric, 1894-1979, author
Penguin Books, 1982
Buku Teks
Partridge, Eric, 1894-1979, author
Hamish Hamilton, 1994
Buku Referensi
Langan, John, 1942-, author
McGraw-Hill, 2013
Buku Teks