Enger, Eldon D.
McGraw-Hill, 2010
Buku Teks
Oxford University Press, 1997
Buku Teks
Eccleston, Charles H.
CRC Press, Taylor & Francis Group, 2011
Buku Teks
by Kenneth A. Dahlberg [and others]
Duke University Press, 1985
Buku Teks
Baumol, William J.
Prentice-Hall, 1979
Buku Teks