Seager, Spencer L., author
Thomson Brooks/Cole, 2008
Buku Teks
McMurry, John, author
Prentice-Hall, 1994
Buku Teks
McMurry, John, author
Prentice-Hall, 1992
Buku Teks
Seager, Spencer L., author
West Publishing Company, 1994
Buku Teks
Seager, Spencer L., author
Thomson Brooks/Cole, 2008
Buku Teks