Hauss, Charles, author
Wadsworth, 2009
Buku Teks
Hauss, Charles, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Christian Soe
McGraw-Hill, 2004
Buku Teks
Gutteridge, H. C.
Cambridge University Press, 1949
Buku Teks
Kesselman, Mark, author
Wadsworth and Cengage Learning, 2013
Buku Teks