Hare, Ronald
Churchill, 1979
Buku Teks
Stewart, F.S.
English Language Book Society, 1977
Buku Teks
Muir, Robert
Henry Frowde, Hodder & Stoughton, 1921
Buku Teks
Swingle, Deane B.
D. Van Nostrand, 1950
Buku Teks
Jordan, Edwin O.
W.B. Saunders, 1946
Buku Teks