Stoessinger, John G., author
Thomson Wadsworth, 2008
Buku Teks
Stoessinger, John G., author
Wadsworth and Cengage Learning, 2011
Buku Teks
Knorr, Klaus
Princeton University Press, 1956
Buku Teks
Pike, William H.
Dow Joner-Irwin, 1983
Buku Teks
Peter, Laurence J., author
Erlangga, 1988
Buku Teks