Alexander, John W., author
Prentice-Hall, 1979
Buku Teks
Hartshorn, Truman Asa, author
Prentice-Hall, 1988
Buku Teks
Alexander, John W., author
Prentice-Hall, 1979
Buku Teks
Daniel, Peter, author
Oliver & Boyd, 1993
Buku Teks
Knox, Paul, author
Edward Arnold , 1994
Buku Teks