Hare, Ronald, author
Longman, 1967
Buku Teks
Hare, Ronald, author
Churchill, 1979
Buku Teks
Muir, Robert, author
Henry Frowde, Hodder & Stoughton, 1921
Buku Teks
by John G. Holt [and others]
Williams & Wilkins, 1993
Buku Teks
Salle, A.J., author
McGraw-Hill, 1961
Buku Teks