Moore, Gary A.
South-western Publishing, 1987
Buku Teks
Kubasek, Nancy K.
Pearson Prentice Hall, c2009
Buku Teks
Kubasek, Nancy K.
Pearson, 2015
Buku Teks
Beatty, Jeffrey F.
South Western Cengage Learning, 2011
Buku Teks
Butzer, Karl W.
Cambridge University Press, 1982
Buku Teks