Robinson, E. A. G., author
Digswell Place James Nisbet, 1958
Buku Teks
Mints, Lloyd W., author
McGraw-Hill, 1950
Buku Teks
Stigler, George J., author
Macmillan, 1942
Buku Teks
Raa, Thijs Ten, author
Harvester Wheatsheaf, 1995
Buku Teks
Vanderlinde, Jack
John Wiley & Sons, 1993
Buku Teks