Friedman, Milton, 1912-2006
The University of Chicago Press, 1962
Buku Teks SO
Sprott, Samuel Ernest, 1919-
Blackwell, 1953
Buku Teks SO
edited by David Loewenstein, James Grantham Turner
Cambridge University Press, 1990
Buku Teks SO
Bradford, Richard, 1957-
Routledge, 2001
Buku Teks SO
Friedman, Milton, 1912-2006
The University of Chicago Press , 1953
Buku Teks SO