Comfort, Jeremy, author
Oxford University Press, 1994
Buku Teks
Kench, A. B.
Macmillan, 1972
Buku Teks
Winterowd, W. Ross
Harcourt Brace Jovanovich, 1981
Buku Teks
Boyle, John Andrew, author
Luzac & Company, 1949
Buku Referensi
Macdonell, Arthur Anthony, 1854-1930, author
Oxford University Press, 1954
Buku Referensi