Mayer, John Robert, author
Massachusetts Harvard University Press , 1965
Buku Teks
Owen, Wilfred, author
Brookings Institution, 1966
Buku Teks
Black, Alan, author
McGraw-Hill, 1995
Buku Teks
Black, Alan, author
McGraw-Hill, 1995
Buku Teks
Small, Kenneth A., author
Routledge, 2007
Buku Teks