Rourke, John T., author
Mc Graw Hill, 2009
Buku Teks
Andrew Hurrell, Ngaire Woods, Satria Utama S., Diana Arimbi
Fakultas Ekonomi UI, 2001
Buku Teks
Carlson, Lucile, author
Prentice-Hall, 1960
Buku Teks
edited Steven L. Spiegel
St. Martin's Press, 1981
Buku Teks
Forsythe, David P., 1941-, author
University of Nebraska Press, 1983
Buku Teks