Schiavo-Campo, Salvatore
Winthrop Publishers, Inc., 1978
Buku Teks
Chacholiades, Miltiades, author
McGraw-Hill, 1981
Buku Teks
Gilpin, Robert, author
Princeton University Press, 1987
Buku Teks
Krugman, Paul R., author
Pearson Education , 2014
Buku Teks
Lowenfeld, Andreas F., author
Matthew Bender, 1983
Buku Teks