Lamont, Douglas, author
Blackwell Publishers, 1996
Buku Referensi
Brady, James E., author
John Wiley & Sons, 1981
Buku Teks
William Kaufmann, 1975
Buku Teks
Enger, Eldon D., author
McGraw-Hill, 2009
Buku Teks
Cooper, Melanie M., author
McGraw-Hill, 2009
Buku Teks