Balaam, David N., 1950-, author
Pearson/Prentice Hall, 2005
Buku Teks
edited by Robert Z. Aliber
Macmillan, 1977
Buku Teks
Davidson, Jamie S., author
Cambridge University Press, 2015
eBooks
Cambridge University Press, 2019
eBooks
Okun, Arthur M., author
C.C. Norton, 1969
Buku Teks