James Cook University of North Queensland
James Cook University, 1993
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
Lewis, Wyndham
Greenwood Press, 1952
Buku Teks