Brinton, Crane, 1898-1968, author
Prentice-Hall, 1963
Buku Teks SO
Hearnshaw, Leslie Spencer, author
Routledge , 1989
Buku Teks
Kearl, Michael C., author
Allyn and Bacon, 1992
Buku Teks
Routledge, 2000
Buku Teks
Westing, John Howard, author
Macmillan, c1975
Buku Teks