Hunt, Elgin F., author
MacMillan, 1987
Buku Teks
Hunt, Elgin F., author
Macmillan, 1984
Buku Teks
Hunt, Elgin F., author
Macmillan, 1962
Buku Teks
Williams, Malcolm, 1953-, author
Routledge, 2000
Buku Teks SO
Bierstedt, Robert, author
McGraw-Hill, 1964
Buku Teks