Barber, Laurie
Century Hutchinson, 1989
Buku Teks
McDermott, John W., author
Waikiki , 1976
Buku Teks
Departement of Statistics, 1990
Buku Referensi
Belich, James, author
Penguin Books, 1988
Buku Teks
King, Michael
Hodder and Stoughton, 1988
Buku Teks