Buchanan, James M., author
Liberty Fund, Inc., 2001
Buku Referensi
Buchanan, James M., author
Liberty Fund, Inc., 2001
Buku Referensi
Perkins, John
Berrett-Koehler Publishers, 2016
Buku Teks
Perkins, John, author
Abdi Tandur, 2005
Buku Teks
Perkins, John, author
Berrett-Kochler, 2004
Buku Teks