Hacker, Diana
Bedford Books of St. Martin?s Press, 1995
Buku Teks
edited by Barry Turner
Macmillan, 1995
Buku Referensi
Winterowd, W. Ross
Harcourt Brace Jovanovich, 1981
Buku Teks
Wyler, Robert C
Macmillan, 1968
Buku Teks
Maugham, W. Somerset, author
Heineman, 1949
Buku Teks