Wright, D. Franklin, author
D.C. Heath, 1990
Buku Referensi
Black, J., author
John Wiley & Sons, 1980
Buku Teks
Gormally, John, author
Prentice-Hall, 2000
Buku Teks
Crowe, Jonathan, author
Oxford University Press, 2010
Buku Teks
Schwedt, Georg, author
John Wiley & Sons, 2001
Buku Teks