Ferguson, C.E.
Irwin, 1975
Buku Teks
Gould, John P.
Richard D. Irwin Inc., c1980
Buku Teks
Samuelson, Paul Anthony, 1915-2009
[publisher not identified], [date of publication not identified]
Buku Teks
Ferguson, C.E.
Richard D. Irwin, 1966
Buku Teks SO
Freeman, A. Myrick, 1936-
Harper & Row , 1983
Buku Teks