Hoag, Erleen J.
Prentice-Hall, 1991
Buku Teks SO
Kohler, Heinz
Alfred A. Knoff , 1961
Buku Teks SO
edited by Paul A. Samuelson
McGraw-Hill, 1970
Buku Teks SO
Hailstones, Thomas J.
South-Western Publishing, 1974
Buku Teks SO
Samuelson, Paul Anthony, 1915-2009
McGraw-Hill, 1985
Buku Teks