Foster, David
Penguin Books, 1986
Buku Teks
Oxford University Press, 1997
Buku Referensi
Beasley, Norman
Buell, Sloan and Pearce, 1952
Buku Teks
Durrell, Gerald, foreword
William Collins Sons, 1981
Buku Teks
Neimark, Edith D., author
Harcourt Brace Javanovich, 1987
Buku Teks