Hoffman, K. Douglas
Harcourt College Publishers, 2002
Buku Teks
Still, Richard R.
Prentice-Hall, 1988
Buku Teks
McDaniel, Carl
South Western Cengage Learning, 2012
Buku Teks
Still, Richard R.
Prentice-Hall, 1966
Buku Teks
Lovelock, Christopher H.
Pearson Prentice Hall, 2001
Buku Teks