Eastman, Joseph T., author
Academic Press, 1993
Buku Teks
Grattan, C. Hartley
The University of Michigan Press, 1963
Buku Teks
Gurning, Berman Asbudin, author
Fakultas Ekonomi Universitas Indonesia, 2008
UI - Tesis (Open)
Rothwell, Donald R
The Federation Press, 1997
Buku Teks
Buchanan, James M., author
Liberty Fund, Inc., 1999
Buku Referensi